ITS#4312: fixed <netinet/tcp.h> detection for AIX and other

platforms where it requires <netinet/in.h> to be previously included.

configure

@@ -13972,14 +13972,13 @@ fi
-
 for ac_header in \
 	arpa/inet.h		\
-	arpa/nameser.h		\
+	arpa/nameser.h	\
 	assert.h		\
-	bits/types.h		\
+	bits/types.h	\
 	conio.h			\
 	crypt.h			\
 	direct.h		\
@@ -13992,7 +13991,6 @@ for ac_header in \
 	libutil.h		\
 	limits.h		\
 	locale.h		\
-	netinet/tcp.h		\
 	malloc.h		\
 	memory.h		\
 	psap.h			\
@@ -14009,11 +14007,11 @@ for ac_header in \
 	sys/errno.h		\
 	sys/ioctl.h		\
 	sys/param.h		\
-	sys/resource.h		\
-	sys/select.h		\
-	sys/socket.h		\
+	sys/resource.h	\
+	sys/select.h	\
+	sys/socket.h	\
 	sys/stat.h		\
-	sys/syslog.h		\
+	sys/syslog.h	\
 	sys/time.h		\
 	sys/types.h		\
 	sys/uio.h		\
@@ -14238,6 +14236,70 @@ done
+for ac_header in netinet/tcp.h
+do
+as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
+echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+#include <netinet/in.h>
+
+
+#include <$ac_header>
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  eval "$as_ac_Header=yes"
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+eval "$as_ac_Header=no"
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6
+if test `eval echo '${'$as_ac_Header'}'` = yes; then
+  cat >>confdefs.h <<_ACEOF
+#define `echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+
+
 for ac_header in sys/ucred.h
 do
 as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`

configure.in

@@ -864,11 +864,11 @@ AC_HEADER_DIRENT
 AC_HEADER_SYS_WAIT
 AC_HEADER_TIOCGWINSZ
 
-AC_CHECK_HEADERS(		\
+AC_CHECK_HEADERS(	\
 	arpa/inet.h		\
-	arpa/nameser.h		\
+	arpa/nameser.h	\
 	assert.h		\
-	bits/types.h		\
+	bits/types.h	\
 	conio.h			\
 	crypt.h			\
 	direct.h		\
@@ -881,7 +881,6 @@ AC_CHECK_HEADERS(		\
 	libutil.h		\
 	limits.h		\
 	locale.h		\
-	netinet/tcp.h		\
 	malloc.h		\
 	memory.h		\
 	psap.h			\
@@ -898,11 +897,11 @@ AC_CHECK_HEADERS(		\
 	sys/errno.h		\
 	sys/ioctl.h		\
 	sys/param.h		\
-	sys/resource.h		\
-	sys/select.h		\
-	sys/socket.h		\
+	sys/resource.h	\
+	sys/select.h	\
+	sys/socket.h	\
 	sys/stat.h		\
-	sys/syslog.h		\
+	sys/syslog.h	\
 	sys/time.h		\
 	sys/types.h		\
 	sys/uio.h		\
@@ -915,11 +914,16 @@ AC_CHECK_HEADERS(		\
 )
 
 AC_CHECK_HEADERS( resolv.h, [], [],
-[$ac_includes_default]
+[$ac_includes_default
 #include <netinet/in.h>
-)
+])
+
+AC_CHECK_HEADERS( netinet/tcp.h, [], [],
+[$ac_includes_default
+#include <netinet/in.h>
+])
 
-AC_CHECK_HEADERS(sys/ucred.h, [], [],
+AC_CHECK_HEADERS( sys/ucred.h, [], [],
 [$ac_includes_default
 #ifdef HAVE_SYS_PARAM_H
 #include <sys/param.h>