configure: Fix the <sys/sysmacros.h> check
AC_HEADER_MAJOR only defines MAJOR_IN_SYSMACROS if major() is _not_
defined by <sys/types.h> alone. It is, but it warns, and that's ugly.
To fix this, push -Werror into CFLAGS when invoking AC_HEADER_MAJOR so
the warning makes the compilation test fail.
Reviewed-by: Emil Velikov <emil.velilkov@collabora.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
diff --git a/configure.ac b/configure.ac
index e5158b7..43fcf68 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,7 +54,11 @@
AC_SYS_LARGEFILE
AC_FUNC_ALLOCA
+save_CFLAGS="$CFLAGS"
+export CFLAGS="$CFLAGS -Werror"
AC_HEADER_MAJOR
+CFLAGS="$save_CFLAGS"
+
AC_CHECK_HEADERS([sys/sysctl.h sys/select.h])
# Initialize libtool
