diff --git a/configure b/configure
index 0eb25dd..544c3f6 100755
--- a/configure
+++ b/configure
@@ -284,7 +284,7 @@
 # default flags for all hosts
 QEMU_CFLAGS="-fno-strict-aliasing $QEMU_CFLAGS"
 QEMU_CFLAGS="-Wall -Wundef -Wwrite-strings -Wmissing-prototypes $QEMU_CFLAGS"
-QEMU_CFLAGS="-Wredundant-decls $QEMU_CFLAGS"
+QEMU_CFLAGS="-Wstrict-prototypes -Wredundant-decls $QEMU_CFLAGS"
 QEMU_CFLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE $QEMU_CFLAGS"
 QEMU_INCLUDES="-I. -I\$(SRC_PATH) -I\$(SRC_PATH)/include"
 if test "$debug_info" = "yes"; then
@@ -3115,20 +3115,27 @@
 fi
 
 ########################################
-# check whether we can disable the -Wunused-but-set-variable
-# option with a pragma (this is needed to silence a warning in
-# some versions of the valgrind VALGRIND_STACK_DEREGISTER macro.)
-# This test has to be compiled with -Werror as otherwise an
-# unknown pragma is only a warning.
+# check whether we can disable warning option with a pragma (this is needed
+# to silence warnings in the headers of some versions of external libraries).
+# This test has to be compiled with -Werror as otherwise an unknown pragma is
+# only a warning.
+#
+# If we can't selectively disable warning in the code, disable -Werror so that
+# the build doesn't fail anyway.
+
 pragma_disable_unused_but_set=no
 cat > $TMPC << EOF
 #pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#pragma GCC diagnostic ignored "-Wstrict-prototypes"
+
 int main(void) {
     return 0;
 }
 EOF
 if compile_prog "-Werror" "" ; then
     pragma_diagnostic_available=yes
+else
+    werror=no
 fi
 
 ########################################
diff --git a/ui/gtk.c b/ui/gtk.c
index 5f91de4..008a6f8 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -34,7 +34,18 @@
 #define GETTEXT_PACKAGE "qemu"
 #define LOCALEDIR "po"
 
+#include "qemu-common.h"
+
+#ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE
+/* Work around an -Wstrict-prototypes warning in GTK headers */
+#pragma GCC diagnostic ignored "-Wstrict-prototypes"
+#endif
 #include <gtk/gtk.h>
+#ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE
+#pragma GCC diagnostic error "-Wstrict-prototypes"
+#endif
+
+
 #include <gdk/gdkkeysyms.h>
 #include <glib/gi18n.h>
 #include <locale.h>
@@ -46,7 +57,6 @@
 #include <pty.h>
 #include <math.h>
 
-#include "qemu-common.h"
 #include "ui/console.h"
 #include "sysemu/sysemu.h"
 #include "qmp-commands.h"