From a4938cc64aa9adc95a8ff1822f36c1dccb2d540e Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Tue, 23 Jan 2001 00:57:58 +0000
Subject: [PATCH] check if unistd.h declares fd_set

---
 configure.in | 42 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/configure.in b/configure.in
index 6ac9932802..e532567e71 100644
--- a/configure.in
+++ b/configure.in
@@ -18,7 +18,7 @@ AC_DIVERT_PUSH(AC_DIVERSION_NOTICE)dnl
 esyscmd([sed "s/^/# /" COPYRIGHT])dnl
 AC_DIVERT_POP()dnl
 
-AC_REVISION($Revision: 1.216 $)
+AC_REVISION($Revision: 1.217 $)
 
 AC_INIT(lib/dns/name.c)
 AC_PREREQ(2.13)
@@ -318,13 +318,51 @@ AC_PROG_YACC
 
 AC_HEADER_STDC
 
-AC_CHECK_HEADERS(fcntl.h sys/time.h unistd.h sys/sockio.h)
+AC_CHECK_HEADERS(fcntl.h sys/time.h unistd.h sys/sockio.h sys/select.h)
 
 AC_C_CONST
 AC_C_INLINE
 AC_TYPE_SIZE_T
 AC_HEADER_TIME
 
+#
+# check if we need to #include sys/select.h explicitly
+#
+case $ac_cv_header_unistd_h in
+yes)
+AC_MSG_CHECKING(if unistd.h defines fd_set)
+AC_TRY_COMPILE([
+#include <unistd.h>],
+[fd_set read_set; return (0);],
+	[AC_MSG_RESULT(yes)
+	 ISC_PLATFORM_NEEDSYSSELECTH="#undef ISC_PLATFORM_NEEDSYSSELECTH"
+	 LWRES_PLATFORM_NEEDSYSSELECTH="#undef LWRES_PLATFORM_NEEDSYSSELECTH"],
+	[AC_MSG_RESULT(no)
+	case ac_cv_header_sys_select_h in
+	yes)
+         ISC_PLATFORM_NEEDSYSSELECTH="#define ISC_PLATFORM_NEEDSYSSELECTH 1"
+	 LWRES_PLATFORM_NEEDSYSSELECTH="#define LWRES_PLATFORM_NEEDSYSSELECTH 1"
+		;;
+	no)
+		AC_MSG_ERROR(["need either working unistd.h or sys/select.h"])
+		;;
+	esac
+	])
+	;;
+no)
+	case ac_cv_header_sys_select_h in
+	yes)
+             ISC_PLATFORM_NEEDSYSSELECTH="#define ISC_PLATFORM_NEEDSYSSELECTH 1"
+	     LWRES_PLATFORM_NEEDSYSSELECTH="#define LWRES_PLATFORM_NEEDSYSSELECTH 1"
+		;;
+	no)
+		AC_MSG_ERROR(["need either unistd.h or sys/select.h"])
+		;;
+	esac
+	;;
+esac
+AC_SUBST(ISC_PLATFORM_NEEDSYSSELECTH)
+AC_SUBST(LWRES_PLATFORM_NEEDSYSSELECTH)
 #
 # Begin pthreads checking.
 #