diff --git a/autoconf/ast_ext_tool_check.m4 b/autoconf/ast_ext_tool_check.m4
index ef762eb877..cbe109e4a1 100644
--- a/autoconf/ast_ext_tool_check.m4
+++ b/autoconf/ast_ext_tool_check.m4
@@ -11,7 +11,7 @@ AC_DEFUN([AST_EXT_TOOL_CHECK],
 		AC_PATH_TOOL(CONFIG_$1, $2, No, [${$1_DIR}/bin:$PATH])
 		if test ! "x${CONFIG_$1}" = xNo; then
 			$1_INCLUDE=$(${CONFIG_$1} m4_default([$3],[--cflags]))
-			$1_INCLUDE=$(echo ${$1_INCLUDE} | $SED -e "s|-I|-I${$1_DIR}|g")
+			$1_INCLUDE=$(echo ${$1_INCLUDE} | $SED -e "s|-I|-I${$1_DIR}|g" -e "s|-std=c99||g")
 
 			$1_LIB=$(${CONFIG_$1} m4_default([$4],[--libs]))
 			$1_LIB=$(echo ${$1_LIB} | $SED -e "s|-L|-L${$1_DIR}|g")
diff --git a/autoconf/ast_pkgconfig.m4 b/autoconf/ast_pkgconfig.m4
index ae7bbc0865..3415ed5479 100644
--- a/autoconf/ast_pkgconfig.m4
+++ b/autoconf/ast_pkgconfig.m4
@@ -5,7 +5,7 @@ AC_DEFUN([AST_PKG_CONFIG_CHECK],
    if test "x${PBX_$1}" != "x1" -a "${USE_$1}" != "no"; then
       PKG_CHECK_MODULES($1, $2, [
             PBX_$1=1
-            $1_INCLUDE="$$1_CFLAGS"
+            $1_INCLUDE=$(echo ${$1_CFLAGS} | $SED -e "s|-std=c99||g")
             $1_LIB="$$1_LIBS"
             AC_DEFINE([HAVE_$1], 1, [Define if your system has the $1 libraries.])
          ], [
diff --git a/configure b/configure
index 3a8c5051a6..472221fd6f 100755
--- a/configure
+++ b/configure
@@ -13428,7 +13428,7 @@ else
 $as_echo "yes" >&6; }
 
             PBX_LIBEDIT=1
-            LIBEDIT_INCLUDE="$LIBEDIT_CFLAGS"
+            LIBEDIT_INCLUDE=$(echo ${LIBEDIT_CFLAGS} | $SED -e "s|-std=c99||g")
             LIBEDIT_LIB="$LIBEDIT_LIBS"
 
 $as_echo "#define HAVE_LIBEDIT 1" >>confdefs.h
@@ -14102,7 +14102,7 @@ fi
 
 		if test ! "x${CONFIG_LIBXML2}" = xNo; then
 			LIBXML2_INCLUDE=$(${CONFIG_LIBXML2} --cflags)
-			LIBXML2_INCLUDE=$(echo ${LIBXML2_INCLUDE} | $SED -e "s|-I|-I${LIBXML2_DIR}|g")
+			LIBXML2_INCLUDE=$(echo ${LIBXML2_INCLUDE} | $SED -e "s|-I|-I${LIBXML2_DIR}|g" -e "s|-std=c99||g")
 
 			LIBXML2_LIB=$(${CONFIG_LIBXML2} --libs)
 			LIBXML2_LIB=$(echo ${LIBXML2_LIB} | $SED -e "s|-L|-L${LIBXML2_DIR}|g")
@@ -20494,7 +20494,7 @@ else
 $as_echo "yes" >&6; }
 
             PBX_ILBC=1
-            ILBC_INCLUDE="$ILBC_CFLAGS"
+            ILBC_INCLUDE=$(echo ${ILBC_CFLAGS} | $SED -e "s|-std=c99||g")
             ILBC_LIB="$ILBC_LIBS"
 
 $as_echo "#define HAVE_ILBC 1" >>confdefs.h
@@ -22632,7 +22632,7 @@ fi
 
 		if test ! "x${CONFIG_MYSQLCLIENT}" = xNo; then
 			MYSQLCLIENT_INCLUDE=$(${CONFIG_MYSQLCLIENT} --cflags)
-			MYSQLCLIENT_INCLUDE=$(echo ${MYSQLCLIENT_INCLUDE} | $SED -e "s|-I|-I${MYSQLCLIENT_DIR}|g")
+			MYSQLCLIENT_INCLUDE=$(echo ${MYSQLCLIENT_INCLUDE} | $SED -e "s|-I|-I${MYSQLCLIENT_DIR}|g" -e "s|-std=c99||g")
 
 			MYSQLCLIENT_LIB=$(${CONFIG_MYSQLCLIENT} --libs)
 			MYSQLCLIENT_LIB=$(echo ${MYSQLCLIENT_LIB} | $SED -e "s|-L|-L${MYSQLCLIENT_DIR}|g")
@@ -22849,7 +22849,7 @@ fi
 
 		if test ! "x${CONFIG_NEON}" = xNo; then
 			NEON_INCLUDE=$(${CONFIG_NEON} --cflags)
-			NEON_INCLUDE=$(echo ${NEON_INCLUDE} | $SED -e "s|-I|-I${NEON_DIR}|g")
+			NEON_INCLUDE=$(echo ${NEON_INCLUDE} | $SED -e "s|-I|-I${NEON_DIR}|g" -e "s|-std=c99||g")
 
 			NEON_LIB=$(${CONFIG_NEON} --libs)
 			NEON_LIB=$(echo ${NEON_LIB} | $SED -e "s|-L|-L${NEON_DIR}|g")
@@ -22969,7 +22969,7 @@ fi
 
 		if test ! "x${CONFIG_NEON29}" = xNo; then
 			NEON29_INCLUDE=$(${CONFIG_NEON29} --cflags)
-			NEON29_INCLUDE=$(echo ${NEON29_INCLUDE} | $SED -e "s|-I|-I${NEON29_DIR}|g")
+			NEON29_INCLUDE=$(echo ${NEON29_INCLUDE} | $SED -e "s|-I|-I${NEON29_DIR}|g" -e "s|-std=c99||g")
 
 			NEON29_LIB=$(${CONFIG_NEON29} --libs)
 			NEON29_LIB=$(echo ${NEON29_LIB} | $SED -e "s|-L|-L${NEON29_DIR}|g")
@@ -23113,7 +23113,7 @@ fi
 
 		if test ! "x${CONFIG_NETSNMP}" = xNo; then
 			NETSNMP_INCLUDE=$(${CONFIG_NETSNMP} --cflags)
-			NETSNMP_INCLUDE=$(echo ${NETSNMP_INCLUDE} | $SED -e "s|-I|-I${NETSNMP_DIR}|g")
+			NETSNMP_INCLUDE=$(echo ${NETSNMP_INCLUDE} | $SED -e "s|-I|-I${NETSNMP_DIR}|g" -e "s|-std=c99||g")
 
 			NETSNMP_LIB=$(${CONFIG_NETSNMP} --agent-libs)
 			NETSNMP_LIB=$(echo ${NETSNMP_LIB} | $SED -e "s|-L|-L${NETSNMP_DIR}|g")
@@ -24599,7 +24599,7 @@ else
 $as_echo "yes" >&6; }
 
             PBX_PJPROJECT=1
-            PJPROJECT_INCLUDE="$PJPROJECT_CFLAGS"
+            PJPROJECT_INCLUDE=$(echo ${PJPROJECT_CFLAGS} | $SED -e "s|-std=c99||g")
             PJPROJECT_LIB="$PJPROJECT_LIBS"
 
 $as_echo "#define HAVE_PJPROJECT 1" >>confdefs.h
@@ -25653,7 +25653,7 @@ else
 $as_echo "yes" >&6; }
 
             PBX_PYTHONDEV=1
-            PYTHONDEV_INCLUDE="$PYTHONDEV_CFLAGS"
+            PYTHONDEV_INCLUDE=$(echo ${PYTHONDEV_CFLAGS} | $SED -e "s|-std=c99||g")
             PYTHONDEV_LIB="$PYTHONDEV_LIBS"
 
 $as_echo "#define HAVE_PYTHONDEV 1" >>confdefs.h
@@ -25839,7 +25839,7 @@ else
 $as_echo "yes" >&6; }
 
             PBX_PORTAUDIO=1
-            PORTAUDIO_INCLUDE="$PORTAUDIO_CFLAGS"
+            PORTAUDIO_INCLUDE=$(echo ${PORTAUDIO_CFLAGS} | $SED -e "s|-std=c99||g")
             PORTAUDIO_LIB="$PORTAUDIO_LIBS"
 
 $as_echo "#define HAVE_PORTAUDIO 1" >>confdefs.h
@@ -32345,7 +32345,7 @@ else
 $as_echo "yes" >&6; }
 
             PBX_GMIME=1
-            GMIME_INCLUDE="$GMIME_CFLAGS"
+            GMIME_INCLUDE=$(echo ${GMIME_CFLAGS} | $SED -e "s|-std=c99||g")
             GMIME_LIB="$GMIME_LIBS"
 
 $as_echo "#define HAVE_GMIME 1" >>confdefs.h
@@ -33254,7 +33254,7 @@ fi
 
 		if test ! "x${CONFIG_SDL}" = xNo; then
 			SDL_INCLUDE=$(${CONFIG_SDL} --cflags)
-			SDL_INCLUDE=$(echo ${SDL_INCLUDE} | $SED -e "s|-I|-I${SDL_DIR}|g")
+			SDL_INCLUDE=$(echo ${SDL_INCLUDE} | $SED -e "s|-I|-I${SDL_DIR}|g" -e "s|-std=c99||g")
 
 			SDL_LIB=$(${CONFIG_SDL} --libs)
 			SDL_LIB=$(echo ${SDL_LIB} | $SED -e "s|-L|-L${SDL_DIR}|g")
@@ -33782,7 +33782,7 @@ else
 $as_echo "yes" >&6; }
 
             PBX_GTK2=1
-            GTK2_INCLUDE="$GTK2_CFLAGS"
+            GTK2_INCLUDE=$(echo ${GTK2_CFLAGS} | $SED -e "s|-std=c99||g")
             GTK2_LIB="$GTK2_LIBS"
 
 $as_echo "#define HAVE_GTK2 1" >>confdefs.h
@@ -33893,7 +33893,7 @@ else
 $as_echo "yes" >&6; }
 
             PBX_SYSTEMD=1
-            SYSTEMD_INCLUDE="$SYSTEMD_CFLAGS"
+            SYSTEMD_INCLUDE=$(echo ${SYSTEMD_CFLAGS} | $SED -e "s|-std=c99||g")
             SYSTEMD_LIB="$SYSTEMD_LIBS"
 
 $as_echo "#define HAVE_SYSTEMD 1" >>confdefs.h
diff --git a/menuselect/configure b/menuselect/configure
index 6e5331eddb..a0aa10928e 100755
--- a/menuselect/configure
+++ b/menuselect/configure
@@ -4392,7 +4392,7 @@ fi
 
 		if test ! "x${CONFIG_LIBXML2}" = xNo; then
 			LIBXML2_INCLUDE=$(${CONFIG_LIBXML2} --cflags)
-			LIBXML2_INCLUDE=$(echo ${LIBXML2_INCLUDE} | $SED -e "s|-I|-I${LIBXML2_DIR}|g")
+			LIBXML2_INCLUDE=$(echo ${LIBXML2_INCLUDE} | $SED -e "s|-I|-I${LIBXML2_DIR}|g" -e "s|-std=c99||g")
 
 			LIBXML2_LIB=$(${CONFIG_LIBXML2} --libs)
 			LIBXML2_LIB=$(echo ${LIBXML2_LIB} | $SED -e "s|-L|-L${LIBXML2_DIR}|g")
@@ -4633,7 +4633,7 @@ else
 $as_echo "yes" >&6; }
 
             PBX_GTK2=1
-            GTK2_INCLUDE="$GTK2_CFLAGS"
+            GTK2_INCLUDE=$(echo ${GTK2_CFLAGS} | $SED -e "s|-std=c99||g")
             GTK2_LIB="$GTK2_LIBS"
 
 $as_echo "#define HAVE_GTK2 1" >>confdefs.h