Require python with dnspython module

configure

@@ -936,6 +936,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -1094,6 +1095,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1346,6 +1348,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1483,7 +1494,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1636,6 +1647,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -12208,6 +12220,9 @@ except: exit(1)'
 testply='try: from ply import *
 except: exit(1)'
 
+testdnspython='try: import dns.message
+except: exit(1)'
+
 testminvers='import sys
 if (sys.version_info < (2,7)) or (sys.version_info < (3,2) and sys.version_info >= (3,0)):
    exit(1)'
@@ -12301,6 +12316,19 @@ $as_echo "not found" >&6; }
 $as_echo_n "checking python module 'ply'... " >&6; }
 				if ${PYTHON:-false} -c "$testply"; then
 					{ $as_echo "$as_me:${as_lineno-$LINENO}: result: found" >&5
+$as_echo "found" >&6; }
+				else
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: result: not found" >&5
+$as_echo "not found" >&6; }
+					unset ac_cv_path_PYTHON
+					unset PYTHON
+					continue
+				fi
+
+				{ $as_echo "$as_me:${as_lineno-$LINENO}: checking python module 'dnspython'" >&5
+$as_echo_n "checking python module 'dnspython'... " >&6; }
+				if ${PYTHON:-false} -c "$testdnspython"; then
+					{ $as_echo "$as_me:${as_lineno-$LINENO}: result: found" >&5
 $as_echo "found" >&6; }
 					break
 				else

configure.in

@@ -185,6 +185,9 @@ except: exit(1)'
 testply='try: from ply import *
 except: exit(1)'
 
+testdnspython='try: import dns.message
+except: exit(1)'
+
 testminvers='import sys
 if (sys.version_info < (2,7)) or (sys.version_info < (3,2) and sys.version_info >= (3,0)):
    exit(1)'
@@ -225,6 +228,16 @@ case "$use_python" in
 				AC_MSG_CHECKING([python module 'ply'])
 				if ${PYTHON:-false} -c "$testply"; then
 					AC_MSG_RESULT([found])
+				else
+					AC_MSG_RESULT([not found])
+					unset ac_cv_path_PYTHON
+					unset PYTHON
+					continue
+				fi
+
+				AC_MSG_CHECKING([python module 'dnspython'])
+				if ${PYTHON:-false} -c "$testdnspython"; then
+					AC_MSG_RESULT([found])
 					break
 				else
 					AC_MSG_RESULT([not found])