diff --git a/INSTALL b/INSTALL
index 9ff786775e..7f27ad2093 100644
--- a/INSTALL
+++ b/INSTALL
@@ -5,9 +5,11 @@ To then build from source:
     ./configure
     make
 
-For detailed installation directions, see the guide
-at doc/guide/kea-guide.txt or doc/guide/kea-guide.html.
+Kea depends on C++ compiler, make, libtool, boost (at least includes, but many
+OSes require boost-system library), log4cplus and one crypto library (either
+OpenSSL or Botan) for compilation.  Optional backends (MySQL, PostgreSQL and
+Cassandra) have additional dependencies. For detailed installation directions,
+see the guide at doc/guide/kea-guide.txt or doc/guide/kea-guide.html.
 
 You can find user-contributed OS-specific build/installation
-instructions on the Kea wiki:
-http://kea.isc.org/wiki/SystemSpecificNotes
+instructions on the Kea wiki: http://kea.isc.org/wiki/Install
diff --git a/configure.ac b/configure.ac
index 150fffc772..535201cf30 100755
--- a/configure.ac
+++ b/configure.ac
@@ -106,6 +106,7 @@ AC_LANG([C++])
 AM_CONDITIONAL(USE_GXX, test "X${GXX}" = "Xyes")
 AC_CHECK_DECL([__SUNPRO_CC], [SUNCXX="yes"], [SUNCXX="no"])
 AC_CHECK_DECL([__clang__], [CLANGPP="yes"], [CLANGPP="no"])
+# USE_CLANGPP is no longer used, keep it by summetry with USE_GXX?
 AM_CONDITIONAL(USE_CLANGPP, test "X${CLANGPP}" = "Xyes")
 
 dnl Determine if we are using GNU sed
@@ -136,9 +137,9 @@ AC_DEFUN([KEA_CXX_TRY_FLAG], [
   AC_MSG_CHECKING([whether $CXX supports $1])
 
   kea_save_CXXFLAGS="$CXXFLAGS"
-  CXXFLAGS="$CXXFLAGS $1"
+  CXXFLAGS="$CXXFLAGS -Werror $1"
 
-  AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void){ return 0;}])],
+  AC_LINK_IFELSE([AC_LANG_SOURCE([int main(){ return 0;}])],
                  [kea_cxx_flag=yes], [kea_cxx_flag=no])
   CXXFLAGS="$kea_save_CXXFLAGS"
 
@@ -169,16 +170,12 @@ fi
 # happen if clang++ is used via ccache.  So, although probably suboptimal,
 # we suppress this particular warning.  Note that it doesn't weaken checks
 # on the source code.
-if test "$CLANGPP" = "yes"; then
+if test "X$CLANGPP" = "Xyes"; then
 CXX_VERSION=`$CXX --version 2> /dev/null | head -1`
 KEA_CXXFLAGS="$KEA_CXXFLAGS -Qunused-arguments"
 fi
 
-KEA_CXX_TRY_FLAG([-Wno-missing-field-initializers],
-	[WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG="-Wno-missing-field-initializers"])
-AC_SUBST(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
-# gcc specific settings:
+# gcc/clang specific settings:
 if test "X$GXX" = "Xyes"; then
 CXX_VERSION=`$CXX --version 2> /dev/null | head -1`
 KEA_CXXFLAGS="$KEA_CXXFLAGS -Wall -Wextra -Wnon-virtual-dtor -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare"
@@ -206,13 +203,15 @@ esac
 KEA_CXXFLAGS="$KEA_CXXFLAGS $MULTITHREADING_FLAG"
 
 # Don't use -Werror if configured not to
+werror_extras=
 AC_ARG_WITH(werror,
     AC_HELP_STRING([--with-werror], [Compile using -Werror (default=yes)]),
     [
      case "${withval}" in
          yes) with_werror=1 ;;
          no)  with_werror=0 ;;
-         *)   AC_MSG_ERROR(bad value ${withval} for --with-werror) ;;
+         -*)  with_werror=1; werror_extras=${withval} ;;
+	 *)   AC_MSG_ERROR(bad value ${withval} for --with-werror) ;;
      esac],
      [with_werror=1])
 
@@ -236,6 +235,30 @@ if test $with_werror = 1; then
    CXXFLAGS="$CXXFLAGS_SAVED"
 fi
 
+# Added flags after -Werror
+
+# Some versions of GCC warn about some versions of Boost regarding
+# missing initializer for members in its posix_time.
+# https://svn.boost.org/trac/boost/ticket/3477
+# But older GCC compilers don't have the flag.
+KEA_CXX_TRY_FLAG([-Wno-missing-field-initializers],
+	[KEA_CXXFLAGS="$KEA_CXXFLAGS -Wno-missing-field-initializers"])
+
+if test "X$CLANGPP" = "Xyes"; then
+	# This is to workaround unused variables tcout and tcerr in
+	# log4cplus's streams.h and unused parameters from some of the
+	# Boost headers.
+	KEA_CXXFLAGS="$KEA_CXXFLAGS -Wno-unused-variable -Wno-unused-parameter"
+fi
+
+# Add the extras at the very last
+# Note it can be used to re-enable a (fatal) warning
+for extra in $werror_extras; do
+	KEA_CXX_TRY_FLAG([$extra],
+		[KEA_CXXFLAGS="$KEA_CXXFLAGS $extra"],
+		[AC_MSG_ERROR([$CXX does not support $extra"])])
+done
+
 fi				dnl GXX = yes
 
 # allow building programs with static link.  we need to make it selective
@@ -1114,7 +1137,7 @@ LIBS=$LIBS_SAVED
 AX_BOOST_FOR_KEA
 # Boost offset_ptr is required in one library and not optional right now, so
 # we unconditionally fail here if it doesn't work.
-if test "$BOOST_OFFSET_PTR_WOULDFAIL" = "yes" -a "$werror_ok" = 1; then
+if test "$BOOST_OFFSET_PTR_WOULDFAIL" = "yes" -a X"$werror_ok" = X1; then
     AC_MSG_ERROR([Failed to compile a required header file.  Try upgrading Boost to 1.44 or higher (when using clang++) or specifying --without-werror.  See the ChangeLog entry for Trac no. 2147 for more details.])
 fi
 
diff --git a/src/bin/d2/Makefile.am b/src/bin/d2/Makefile.am
index df266ad4a1..0b4e7d5862 100644
--- a/src/bin/d2/Makefile.am
+++ b/src/bin/d2/Makefile.am
@@ -14,10 +14,6 @@ AM_CPPFLAGS += $(CQL_CPPFLAGS)
 endif
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
-if USE_CLANGPP
-# Disable unused parameter warning caused by some Boost headers when compiling with clang
-AM_CXXFLAGS += -Wno-unused-parameter
-endif
 
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
diff --git a/src/bin/d2/tests/Makefile.am b/src/bin/d2/tests/Makefile.am
index 6c5dbe4866..dc18d81d5e 100644
--- a/src/bin/d2/tests/Makefile.am
+++ b/src/bin/d2/tests/Makefile.am
@@ -29,10 +29,6 @@ CLEANFILES = $(builddir)/interfaces.txt $(builddir)/logger_lockfile
 DISTCLEANFILES = d2_process_tests.sh
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
-if USE_CLANGPP
-# Disable unused parameter warning caused by some Boost headers when compiling with clang
-AM_CXXFLAGS += -Wno-unused-parameter
-endif
 
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
diff --git a/src/bin/dhcp4/Makefile.am b/src/bin/dhcp4/Makefile.am
index 24e2e95d3f..8360677861 100644
--- a/src/bin/dhcp4/Makefile.am
+++ b/src/bin/dhcp4/Makefile.am
@@ -15,10 +15,6 @@ AM_CPPFLAGS += $(CQL_CPPFLAGS)
 endif
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
-if USE_CLANGPP
-# Disable unused parameter warning caused by some Boost headers when compiling with clang
-AM_CXXFLAGS += -Wno-unused-parameter
-endif
 
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
diff --git a/src/bin/dhcp4/tests/Makefile.am b/src/bin/dhcp4/tests/Makefile.am
index ffbf3a3d8d..9f658e14fc 100644
--- a/src/bin/dhcp4/tests/Makefile.am
+++ b/src/bin/dhcp4/tests/Makefile.am
@@ -32,10 +32,6 @@ CLEANFILES += *.json *.log
 DISTCLEANFILES = dhcp4_process_tests.sh
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
-if USE_CLANGPP
-# Disable unused parameter warning caused by some Boost headers when compiling with clang
-AM_CXXFLAGS += -Wno-unused-parameter
-endif
 
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
diff --git a/src/bin/dhcp6/Makefile.am b/src/bin/dhcp6/Makefile.am
index c69e99406c..47155aecf5 100644
--- a/src/bin/dhcp6/Makefile.am
+++ b/src/bin/dhcp6/Makefile.am
@@ -15,10 +15,6 @@ AM_CPPFLAGS += $(CQL_CPPFLAGS)
 endif
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
-if USE_CLANGPP
-# Disable unused parameter warning caused by some Boost headers when compiling with clang
-AM_CXXFLAGS += -Wno-unused-parameter
-endif
 
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
diff --git a/src/bin/dhcp6/tests/Makefile.am b/src/bin/dhcp6/tests/Makefile.am
index 3573b4ad63..a85119cc9a 100644
--- a/src/bin/dhcp6/tests/Makefile.am
+++ b/src/bin/dhcp6/tests/Makefile.am
@@ -33,10 +33,6 @@ CLEANFILES += *.json *.log
 DISTCLEANFILES = dhcp6_process_tests.sh
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
-if USE_CLANGPP
-# Disable unused parameter warning caused by some Boost headers when compiling with clang
-AM_CXXFLAGS += -Wno-unused-parameter
-endif
 
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
diff --git a/src/bin/lfc/Makefile.am b/src/bin/lfc/Makefile.am
index 9cdd5bae78..7bfeb96df7 100644
--- a/src/bin/lfc/Makefile.am
+++ b/src/bin/lfc/Makefile.am
@@ -3,12 +3,7 @@ SUBDIRS = . tests
 AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib
 AM_CPPFLAGS += -I$(top_srcdir)/src/bin -I$(top_builddir)/src/bin
 AM_CPPFLAGS += $(BOOST_INCLUDES)
-
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
-if USE_CLANGPP
-# Disable unused parameter warning caused by some Boost headers when compiling with clang
-AM_CXXFLAGS += -Wno-unused-parameter
-endif
 
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
diff --git a/src/bin/lfc/tests/Makefile.am b/src/bin/lfc/tests/Makefile.am
index 208f970520..ee20ebf94b 100644
--- a/src/bin/lfc/tests/Makefile.am
+++ b/src/bin/lfc/tests/Makefile.am
@@ -24,10 +24,6 @@ CLEANFILES = $(builddir)/interfaces.txt $(builddir)/logger_lockfile
 DISTCLEANFILES = 
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
-if USE_CLANGPP
-# Disable unused parameter warning caused by some Boost headers when compiling with clang
-AM_CXXFLAGS += -Wno-unused-parameter
-endif
 
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
diff --git a/src/bin/perfdhcp/Makefile.am b/src/bin/perfdhcp/Makefile.am
index bf6d1887b0..74d2975bab 100644
--- a/src/bin/perfdhcp/Makefile.am
+++ b/src/bin/perfdhcp/Makefile.am
@@ -6,12 +6,6 @@ AM_CPPFLAGS += $(BOOST_INCLUDES)
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 AM_LDFLAGS = -lm
 if USE_STATIC_LINK
 AM_LDFLAGS += -static
@@ -32,16 +26,8 @@ libperfdhcp_la_SOURCES += rate_control.cc rate_control.h
 libperfdhcp_la_SOURCES += stats_mgr.h
 libperfdhcp_la_SOURCES += test_control.cc test_control.h
 
-libperfdhcp_la_CXXFLAGS = $(AM_CXXFLAGS)
-if USE_CLANGPP
-# Disable unused parameter warning caused by some of the
-# Boost headers when compiling with clang.
-libperfdhcp_la_CXXFLAGS += -Wno-unused-parameter
-endif
-
 sbin_PROGRAMS = perfdhcp
 perfdhcp_SOURCES = main.cc
-libkea_perfdhcp___la_CXXFLAGS = $(AM_CXXFLAGS)
 
 perfdhcp_LDFLAGS = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS)
 
diff --git a/src/bin/perfdhcp/tests/Makefile.am b/src/bin/perfdhcp/tests/Makefile.am
index ab0a914fa3..b41141ac6d 100644
--- a/src/bin/perfdhcp/tests/Makefile.am
+++ b/src/bin/perfdhcp/tests/Makefile.am
@@ -35,12 +35,6 @@ run_unittests_SOURCES += command_options_helper.h
 run_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
 run_unittests_LDFLAGS  = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
 
-if USE_CLANGPP
-# Disable unused parameter warning caused by some of the
-# Boost headers when compiling with clang.
-run_unittests_CXXFLAGS = -Wno-unused-parameter
-endif
-
 run_unittests_LDADD  = $(top_builddir)/src/bin/perfdhcp/libperfdhcp.la
 run_unittests_LDADD += $(top_builddir)/src/lib/cfgrpt/libcfgrpt.la
 run_unittests_LDADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
diff --git a/src/bin/perfdhcp/tests/rate_control_unittest.cc b/src/bin/perfdhcp/tests/rate_control_unittest.cc
index d2824a2729..cf2e0f6e30 100644
--- a/src/bin/perfdhcp/tests/rate_control_unittest.cc
+++ b/src/bin/perfdhcp/tests/rate_control_unittest.cc
@@ -138,7 +138,7 @@ TEST(RateControl, getOutboundMessageCount) {
     // when the calcuation is made may be different from the interval set.)  The
     // margin in this test is reasonably generous, allowing for a timing error
     // of around 10ms.
-    uint64_t count;
+    uint64_t count = 0;
     ASSERT_NO_THROW(count = rc1.getOutboundMessageCount());
     EXPECT_TRUE((count >= 5240) && (count <= 5260)) <<
         "count is " << count << ", expected range 5240-5260";
diff --git a/src/bin/perfdhcp/tests/test_control_unittest.cc b/src/bin/perfdhcp/tests/test_control_unittest.cc
index c125d3383b..6473bdbea1 100644
--- a/src/bin/perfdhcp/tests/test_control_unittest.cc
+++ b/src/bin/perfdhcp/tests/test_control_unittest.cc
@@ -90,6 +90,8 @@ public:
     void setRelativeDueTimes(const int send_secs, const int renew_secs = 0,
                              const int release_secs = 0) {
         ptime now = microsec_clock::universal_time();
+	// Use now to avoid unused but set warning
+	ASSERT_FALSE(now.is_special());
         basic_rate_control_.setRelativeDue(send_secs);
         renew_rate_control_.setRelativeDue(renew_secs);
         release_rate_control_.setRelativeDue(release_secs);
diff --git a/src/hooks/dhcp/user_chk/Makefile.am b/src/hooks/dhcp/user_chk/Makefile.am
index 3636a0bebb..41ad7b2e3c 100644
--- a/src/hooks/dhcp/user_chk/Makefile.am
+++ b/src/hooks/dhcp/user_chk/Makefile.am
@@ -4,12 +4,6 @@ AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
 AM_CPPFLAGS += $(BOOST_INCLUDES)
 AM_CXXFLAGS  = $(KEA_CXXFLAGS)
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 # Define rule to build logging source files from message file
 user_chk_messages.h user_chk_messages.cc: s-messages
 s-messages: user_chk_messages.mes
@@ -48,11 +42,6 @@ nodist_libduc_la_SOURCES = user_chk_messages.cc user_chk_messages.h
 
 libduc_la_CXXFLAGS = $(AM_CXXFLAGS)
 libduc_la_CPPFLAGS = $(AM_CPPFLAGS)
-if USE_CLANGPP
-# Disable unused parameter warning caused by some of the
-# Boost headers when compiling with clang.
-libduc_la_CXXFLAGS += -Wno-unused-parameter
-endif
 
 noinst_LTLIBRARIES += libdhcp_user_chk.la
 
diff --git a/src/hooks/dhcp/user_chk/tests/Makefile.am b/src/hooks/dhcp/user_chk/tests/Makefile.am
index 145e3b1179..fe1960d745 100644
--- a/src/hooks/dhcp/user_chk/tests/Makefile.am
+++ b/src/hooks/dhcp/user_chk/tests/Makefile.am
@@ -8,12 +8,6 @@ AM_CPPFLAGS += -DINSTALL_PROG=\"$(abs_top_srcdir)/install-sh\"
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 USER_CHK_LIB = $(top_builddir)/src/hooks/dhcp/user_chk/libdhcp_user_chk.la
 
 if USE_STATIC_LINK
@@ -44,12 +38,6 @@ libdhcp_user_chk_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES) $(LOG4CPL
 libdhcp_user_chk_unittests_LDFLAGS  = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
 
 libdhcp_user_chk_unittests_CXXFLAGS = $(AM_CXXFLAGS)
-if USE_CLANGPP
-# This is to workaround unused variables tcout and tcerr in
-# log4cplus's streams.h and unused parameters from some of the
-# Boost headers.
-libdhcp_user_chk_unittests_CXXFLAGS += -Wno-unused-parameter
-endif
 
 libdhcp_user_chk_unittests_LDADD = $(top_builddir)/src/hooks/dhcp/user_chk/libduc.la
 libdhcp_user_chk_unittests_LDADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
diff --git a/src/lib/asiolink/tests/Makefile.am b/src/lib/asiolink/tests/Makefile.am
index c3be47f887..6e5592a566 100644
--- a/src/lib/asiolink/tests/Makefile.am
+++ b/src/lib/asiolink/tests/Makefile.am
@@ -8,12 +8,6 @@ if USE_STATIC_LINK
 AM_LDFLAGS = -static
 endif
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 CLEANFILES = *.gcno *.gcda
 
 TESTS_ENVIRONMENT = \
diff --git a/src/lib/dhcp/Makefile.am b/src/lib/dhcp/Makefile.am
index 72c4083545..ccdb74b2ab 100644
--- a/src/lib/dhcp/Makefile.am
+++ b/src/lib/dhcp/Makefile.am
@@ -4,12 +4,6 @@ AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
 AM_CPPFLAGS += $(BOOST_INCLUDES)
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 CLEANFILES = *.gcno *.gcda
 
 lib_LTLIBRARIES = libkea-dhcp++.la
@@ -113,9 +107,3 @@ libkea_dhcp___include_HEADERS = \
     pkt_filter_lpf.h \
     protocol_util.h \
     std_option_defs.h
-
-if USE_CLANGPP
-# Disable unused parameter warning caused by some of the
-# Boost headers when compiling with clang.
-libkea_dhcp___la_CXXFLAGS += -Wno-unused-parameter
-endif
diff --git a/src/lib/dhcp/tests/Makefile.am b/src/lib/dhcp/tests/Makefile.am
index 05928bd7e6..c0c584e712 100644
--- a/src/lib/dhcp/tests/Makefile.am
+++ b/src/lib/dhcp/tests/Makefile.am
@@ -7,12 +7,6 @@ AM_CPPFLAGS += -DINSTALL_PROG=\"$(abs_top_srcdir)/install-sh\"
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
 endif
@@ -102,12 +96,6 @@ libdhcp___unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
 libdhcp___unittests_LDFLAGS  = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
 
 libdhcp___unittests_CXXFLAGS = $(AM_CXXFLAGS)
-if USE_CLANGPP
-# This is to workaround unused variables tcout and tcerr in
-# log4cplus's streams.h and unused parameters from some of the
-# Boost headers.
-libdhcp___unittests_CXXFLAGS += -Wno-unused-variable -Wno-unused-parameter
-endif
 
 libdhcp___unittests_LDADD  = $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
 libdhcp___unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
diff --git a/src/lib/dhcp_ddns/Makefile.am b/src/lib/dhcp_ddns/Makefile.am
index e229943f63..b909bd50b8 100644
--- a/src/lib/dhcp_ddns/Makefile.am
+++ b/src/lib/dhcp_ddns/Makefile.am
@@ -4,13 +4,6 @@ AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
 AM_CPPFLAGS += $(BOOST_INCLUDES)
 AM_CXXFLAGS  = $(KEA_CXXFLAGS)
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
-
 # Define rule to build logging source files from message file
 dhcp_ddns_messages.h dhcp_ddns_messages.cc: s-messages
 
@@ -54,12 +47,4 @@ libkea_dhcp_ddns_la_LIBADD += $(top_builddir)/src/lib/log/libkea-log.la
 libkea_dhcp_ddns_la_LIBADD += $(top_builddir)/src/lib/util/threads/libkea-threads.la
 libkea_dhcp_ddns_la_LIBADD += $(top_builddir)/src/lib/util/libkea-util.la
 libkea_dhcp_ddns_la_LIBADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
-
 libkea_dhcp_ddns_la_LIBADD += $(LOG4CPLUS_LIBS) $(CRYPTO_LIBS)
-
-if USE_CLANGPP
-# Disable unused parameter warning caused by some of the
-# Boost headers when compiling with clang.
-libkea_dhcp_ddns_la_CXXFLAGS += -Wno-unused-parameter
-endif
-
diff --git a/src/lib/dhcp_ddns/tests/Makefile.am b/src/lib/dhcp_ddns/tests/Makefile.am
index 8a0731de31..b0538f5564 100644
--- a/src/lib/dhcp_ddns/tests/Makefile.am
+++ b/src/lib/dhcp_ddns/tests/Makefile.am
@@ -7,12 +7,6 @@ AM_CPPFLAGS += -DINSTALL_PROG=\"$(abs_top_srcdir)/install-sh\"
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
 endif
@@ -33,15 +27,9 @@ libdhcp_ddns_unittests_SOURCES += test_utils.cc test_utils.h
 
 libdhcp_ddns_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
 
-libdhcp_ddns_unittests_LDFLAGS  = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
-
 libdhcp_ddns_unittests_CXXFLAGS = $(AM_CXXFLAGS)
-if USE_CLANGPP
-# This is to workaround unused variables tcout and tcerr in
-# log4cplus's streams.h and unused parameters from some of the
-# Boost headers.
-libdhcp_ddns_unittests_CXXFLAGS += -Wno-unused-parameter
-endif
+
+libdhcp_ddns_unittests_LDFLAGS  = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
 
 libdhcp_ddns_unittests_LDADD = $(top_builddir)/src/lib/dhcp_ddns/libkea-dhcp_ddns.la
 libdhcp_ddns_unittests_LDADD += $(top_builddir)/src/lib/config/libkea-cfgclient.la
diff --git a/src/lib/dhcpsrv/Makefile.am b/src/lib/dhcpsrv/Makefile.am
index 362169052d..70b1152954 100755
--- a/src/lib/dhcpsrv/Makefile.am
+++ b/src/lib/dhcpsrv/Makefile.am
@@ -67,12 +67,6 @@ BUILT_SOURCES = alloc_engine_messages.h alloc_engine_messages.cc
 BUILT_SOURCES += dhcpsrv_messages.h dhcpsrv_messages.cc
 BUILT_SOURCES += hosts_messages.h hosts_messages.cc
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 # Make sure the generated files are deleted in a "clean" operation
 CLEANFILES = *.gcno *.gcda
 CLEANFILES += alloc_engine_messages.h alloc_engine_messages.cc
@@ -208,12 +202,6 @@ if HAVE_CQL
 libkea_dhcpsrv_la_LDFLAGS += $(CQL_LIBS)
 endif
 
-if USE_CLANGPP
-# Disable unused parameter warning caused by some of the
-# Boost headers when compiling with clang.
-libkea_dhcpsrv_la_CXXFLAGS += -Wno-unused-parameter
-endif
-
 # The message file should be in the distribution
 EXTRA_DIST += alloc_engine_messages.mes
 EXTRA_DIST += dhcpsrv_messages.mes
diff --git a/src/lib/dhcpsrv/database_backends.dox b/src/lib/dhcpsrv/database_backends.dox
index 3364e04ceb..104318ece2 100644
--- a/src/lib/dhcpsrv/database_backends.dox
+++ b/src/lib/dhcpsrv/database_backends.dox
@@ -194,6 +194,18 @@ host    all             all             127.0.0.1/32            password
 host    all             all             ::1/128                 password
 @endverbatim
 
+  Another possible problem is to get no password prompt, in general because
+  you have no <tt>pg_hba.conf</tt> config file and everybody is by default
+  trusted. As it has a very bad effect on the security you should have
+  been warned it is a highly unsafe config. The solution is the same,
+  i.e., require password or md5 authentication method. If you lose
+  the postgres user access you can add first:
+@verbatim
+local   all             postgres                                trust
+@endverbatim
+  to trust only the local postgres user. Note the postgres user can
+  be pgsql on some systems.
+
   Please consult your PostgreSQL user manual before applying those changes as
   those changes may expose your other databases that you run on the same system.
   In general case, it is a poor idea to run anything of value on a system
diff --git a/src/lib/dhcpsrv/tests/Makefile.am b/src/lib/dhcpsrv/tests/Makefile.am
index aea9898f7c..2d65439e4d 100755
--- a/src/lib/dhcpsrv/tests/Makefile.am
+++ b/src/lib/dhcpsrv/tests/Makefile.am
@@ -14,12 +14,6 @@ if USE_STATIC_LINK
 AM_LDFLAGS = -static
 endif
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 CLEANFILES = *.gcno *.gcda
 
 TESTS_ENVIRONMENT = \
@@ -144,6 +138,8 @@ if HAVE_CQL
 libdhcpsrv_unittests_CPPFLAGS += $(CQL_CPPFLAGS)
 endif
 
+libdhcpsrv_unittests_CXXFLAGS = $(AM_CXXFLAGS)
+
 libdhcpsrv_unittests_LDFLAGS  = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
 if HAVE_MYSQL
 libdhcpsrv_unittests_LDFLAGS  += $(MYSQL_LIBS)
@@ -155,14 +151,6 @@ if HAVE_CQL
 libdhcpsrv_unittests_LDFLAGS  += $(CQL_LIBS)
 endif
 
-libdhcpsrv_unittests_CXXFLAGS = $(AM_CXXFLAGS)
-if USE_CLANGPP
-# This is to workaround unused variables tcout and tcerr in
-# log4cplus's streams.h and unused parameters from some of the
-# Boost headers.
-libdhcpsrv_unittests_CXXFLAGS += -Wno-unused-variable -Wno-unused-parameter
-endif
-
 libdhcpsrv_unittests_LDADD  = $(top_builddir)/src/lib/dhcpsrv/testutils/libdhcpsrvtest.la
 libdhcpsrv_unittests_LDADD += $(top_builddir)/src/lib/dhcpsrv/libkea-dhcpsrv.la
 libdhcpsrv_unittests_LDADD += $(top_builddir)/src/lib/eval/libkea-eval.la
diff --git a/src/lib/dhcpsrv/tests/csv_lease_file4_unittest.cc b/src/lib/dhcpsrv/tests/csv_lease_file4_unittest.cc
index 214e90da8e..55fc9ed6bd 100644
--- a/src/lib/dhcpsrv/tests/csv_lease_file4_unittest.cc
+++ b/src/lib/dhcpsrv/tests/csv_lease_file4_unittest.cc
@@ -25,8 +25,7 @@ namespace {
 const uint8_t HWADDR0[] = { 0, 1, 2, 3, 4, 5 };
 const uint8_t HWADDR1[] = { 0xd, 0xe, 0xa, 0xd, 0xb, 0xe, 0xe, 0xf };
 
-const uint8_t CLIENTID0[] = { 1, 2, 3, 4 };
-const uint8_t CLIENTID1[] = { 0xa, 0xb, 0xc, 0xd };
+const uint8_t CLIENTID[] = { 1, 2, 3, 4 };
 
 /// @brief Test fixture class for @c CSVLeaseFile4 validation.
 class CSVLeaseFile4Test : public ::testing::Test {
@@ -219,7 +218,7 @@ TEST_F(CSVLeaseFile4Test, recreate) {
     // Create second lease, with non-NULL client id.
     lease.reset(new Lease4(IOAddress("192.0.3.10"),
                            hwaddr1_,
-                           CLIENTID0, sizeof(CLIENTID0),
+                           CLIENTID, sizeof(CLIENTID),
                            100, 60, 90, 0, 7));
     {
     SCOPED_TRACE("Second write");
diff --git a/src/lib/dhcpsrv/tests/host_reservation_parser_unittest.cc b/src/lib/dhcpsrv/tests/host_reservation_parser_unittest.cc
index 05a6a43810..11ed6afe23 100644
--- a/src/lib/dhcpsrv/tests/host_reservation_parser_unittest.cc
+++ b/src/lib/dhcpsrv/tests/host_reservation_parser_unittest.cc
@@ -32,7 +32,7 @@ namespace {
 /// @brief Holds a type of the last identifier in @c IdentifierType enum.
 ///
 /// This value must be updated when new identifiers are added to the enum.
-const Host::IdentifierType LAST_IDENTIFIER_TYPE = Host::IDENT_CIRCUIT_ID;
+// const Host::IdentifierType LAST_IDENTIFIER_TYPE = Host::IDENT_CIRCUIT_ID;
 
 /// @brief Test fixture class for @c HostReservationParser.
 class HostReservationParserTest : public ::testing::Test {
diff --git a/src/lib/dhcpsrv/tests/lease_unittest.cc b/src/lib/dhcpsrv/tests/lease_unittest.cc
index 3604033756..979b965326 100644
--- a/src/lib/dhcpsrv/tests/lease_unittest.cc
+++ b/src/lib/dhcpsrv/tests/lease_unittest.cc
@@ -70,10 +70,6 @@ TEST_F(Lease4Test, constructor) {
      // Get current time for the use in Lease.
     const time_t current_time = time(NULL);
 
-    // Other random constants.
-    const uint32_t SUBNET_ID = 42;
-    const uint32_t VALID_LIFETIME = 500;
-
     // We want to check that various addresses work, so let's iterate over
     // these.
     const uint32_t ADDRESS[] = {
@@ -108,10 +104,6 @@ TEST_F(Lease4Test, copyConstructor) {
     // Get current time for the use in Lease4.
     const time_t current_time = time(NULL);
 
-    // Other random constants.
-    const uint32_t SUBNET_ID = 42;
-    const uint32_t VALID_LIFETIME = 500;
-
     // Create the lease
     Lease4 lease(0xffffffff, hwaddr_, clientid_, VALID_LIFETIME, 0, 0, current_time,
                  SUBNET_ID);
@@ -149,10 +141,6 @@ TEST_F(Lease4Test, operatorAssign) {
     // Get the current time for the use in Lease4.
     const time_t current_time = time(NULL);
 
-    // Other random constants.
-    const uint32_t SUBNET_ID = 42;
-    const uint32_t VALID_LIFETIME = 500;
-
     // Create the lease
     Lease4 lease(0xffffffff, hwaddr_, clientid_, VALID_LIFETIME, 0, 0, current_time,
                  SUBNET_ID);
@@ -257,8 +245,6 @@ TEST_F(Lease4Test, operatorEquals) {
     // Random values for the tests
     const uint32_t ADDRESS = 0x01020304;
     const time_t current_time = time(NULL);
-    const uint32_t SUBNET_ID = 42;
-    const uint32_t VALID_LIFETIME = 500;
 
     // Check when the leases are equal.
     Lease4 lease1(ADDRESS, hwaddr_, clientid_, VALID_LIFETIME, current_time, 0,
@@ -504,7 +490,7 @@ TEST(Lease6Test, Lease6ConstructorDefault) {
     // Other values
     uint8_t llt[] = {0, 1, 2, 3, 4, 5, 6, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
     DuidPtr duid(new DUID(llt, sizeof(llt)));
-    uint32_t iaid = 7;      // Just a number
+    uint32_t iaid = IAID;   // Just a number
     SubnetID subnet_id = 8; // Just another number
 
     for (int i = 0; i < sizeof(ADDRESS) / sizeof(ADDRESS[0]); ++i) {
@@ -551,7 +537,7 @@ TEST(Lease6Test, Lease6ConstructorWithFQDN) {
     // Other values
     uint8_t llt[] = {0, 1, 2, 3, 4, 5, 6, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
     DuidPtr duid(new DUID(llt, sizeof(llt)));
-    uint32_t iaid = 7;      // Just a number
+    uint32_t iaid = IAID;   // Just a number
     SubnetID subnet_id = 8; // Just another number
 
     for (int i = 0; i < sizeof(ADDRESS) / sizeof(ADDRESS[0]); ++i) {
@@ -593,7 +579,7 @@ TEST(Lease6Test, operatorEquals) {
     const IOAddress addr("2001:db8:1::456");
     uint8_t duid_array[] = {0, 1, 2, 3, 4, 5, 6, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
     DuidPtr duid(new DUID(duid_array, sizeof(duid_array)));
-    uint32_t iaid = 7; // just a number
+    uint32_t iaid = IAID;   // just a number
     SubnetID subnet_id = 8; // just another number
 
     // Check for equality.
@@ -723,7 +709,7 @@ TEST(Lease6Test, Lease6Expired) {
     const IOAddress addr("2001:db8:1::456");
     const uint8_t duid_array[] = {0, 1, 2, 3, 4, 5, 6, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
     const DuidPtr duid(new DUID(duid_array, sizeof(duid_array)));
-    const uint32_t iaid = 7;        // Just a number
+    const uint32_t iaid = IAID;     // Just a number
     const SubnetID subnet_id = 8;   // Just another number
     Lease6 lease(Lease::TYPE_NA, addr, duid, iaid, 100, 200, 50, 80,
                                subnet_id);
diff --git a/src/lib/eval/Makefile.am b/src/lib/eval/Makefile.am
index e3d56421dd..2c8dd8ccd7 100644
--- a/src/lib/eval/Makefile.am
+++ b/src/lib/eval/Makefile.am
@@ -4,12 +4,6 @@ AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
 AM_CPPFLAGS += $(BOOST_INCLUDES)
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 # GCC 4.4 emits warning about breaking strict aliasing rule.
 # This warning is a result of a GCC bug:
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41874
diff --git a/src/lib/eval/tests/Makefile.am b/src/lib/eval/tests/Makefile.am
index a492686eff..f3a882efde 100644
--- a/src/lib/eval/tests/Makefile.am
+++ b/src/lib/eval/tests/Makefile.am
@@ -6,12 +6,6 @@ AM_CPPFLAGS += -DLOGGING_SPEC_FILE=\"$(abs_top_srcdir)/src/lib/dhcpsrv/logging.s
 
 AM_CXXFLAGS = $(KEA_CXXFLAGS)
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
 if USE_STATIC_LINK
 AM_LDFLAGS = -static
 endif
@@ -46,14 +40,6 @@ libeval_unittests_LDADD   += $(top_builddir)/src/lib/exceptions/libkea-exception
 libeval_unittests_LDADD   += $(top_builddir)/src/lib/testutils/libkea-testutils.la
 libeval_unittests_LDADD   += $(CRYPTO_LIBS) $(LOG4CPLUS_LIBS)
 libeval_unittests_LDADD   += $(BOOST_LIBS) $(GTEST_LDADD)
-
-if USE_CLANGPP
-# This is to workaround unused variables tcout and tcerr in
-# log4cplus's streams.h and unused parameters from some of the
-# Boost headers.
-libeval_unittests_CXXFLAGS += -Wno-unused-variable -Wno-unused-parameter
-endif
-
 endif
 
 noinst_PROGRAMS = $(TESTS)
diff --git a/src/lib/hooks/Makefile.am b/src/lib/hooks/Makefile.am
index 01f1d4565f..de4c5d6635 100644
--- a/src/lib/hooks/Makefile.am
+++ b/src/lib/hooks/Makefile.am
@@ -4,13 +4,6 @@ AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
 AM_CPPFLAGS += $(BOOST_INCLUDES)
 AM_CXXFLAGS  = $(KEA_CXXFLAGS)
 
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
-
-
 # Define rule to build logging source files from message file
 hooks_messages.h hooks_messages.cc: s-messages
 
@@ -74,9 +67,3 @@ libkea_hooks_include_HEADERS = \
     library_handle.h \
     hooks.h \
     server_hooks.h
-
-if USE_CLANGPP
-# Disable unused parameter warning caused by some of the
-# Boost headers when compiling with clang.
-libkea_hooks_la_CXXFLAGS += -Wno-unused-parameter
-endif
diff --git a/src/lib/hooks/tests/Makefile.am b/src/lib/hooks/tests/Makefile.am
index 22b2a224e7..d9016a6565 100644
--- a/src/lib/hooks/tests/Makefile.am
+++ b/src/lib/hooks/tests/Makefile.am
@@ -4,11 +4,6 @@ AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
 AM_CPPFLAGS += $(BOOST_INCLUDES)
 
 AM_CXXFLAGS  = $(KEA_CXXFLAGS)
-# Some versions of GCC warn about some versions of Boost regarding
-# missing initializer for members in its posix_time.
-# https://svn.boost.org/trac/boost/ticket/3477
-# But older GCC compilers don't have the flag.     
-AM_CXXFLAGS += $(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)
 
 # Kea libraries against which the test user libraries are linked.
 HOOKS_LIB      = $(top_builddir)/src/lib/hooks/libkea-hooks.la
@@ -19,11 +14,6 @@ EXCEPTIONS_LIB = $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
 
 ALL_LIBS       = $(HOOKS_LIB) $(LOG_LIB) $(THREADS_LIB) $(UTIL_LIB) $(EXCEPTIONS_LIB) $(LOG4CPLUS_LIBS)
 
-if USE_CLANGPP
-# see ../Makefile.am
-AM_CXXFLAGS += -Wno-unused-parameter
-endif
-
 # Files to clean include the file created by testing.
 CLEANFILES = *.gcno *.gcda $(builddir)/marker_file.dat
 
diff --git a/src/lib/log/tests/Makefile.am b/src/lib/log/tests/Makefile.am
index d50e8fa9d8..03806f987e 100644
--- a/src/lib/log/tests/Makefile.am
+++ b/src/lib/log/tests/Makefile.am
@@ -71,10 +71,6 @@ TESTS =
 
 # Define the flags used in each set of tests
 TESTSCXXFLAGS  = $(AM_CXXFLAGS)
-if USE_CLANGPP
-# Workaround unused variables tcout and tcerr in log4cplus's streams.h.
-TESTSCXXFLAGS += -Wno-unused-variable
-endif
 TESTSCPPFLAGS  = $(AM_CPPFLAGS) $(GTEST_INCLUDES) $(LOG4CPLUS_INCLUDES)
 TESTSLDFLAGS  = $(AM_LDFLAGS) $(GTEST_LDFLAGS)