Original commit message from CVS:
added -Wall to GST_INT_CFLAGS
dnl Vars for everyone else
GST_INT_LIBS="\$(top_builddir)/gst/libgst.la"
-GST_INT_CFLAGS="-I\$(top_srcdir)/libs -I\$(top_srcdir)/include -I\$(top_srcdir)"
+GST_INT_CFLAGS="-I\$(top_srcdir)/libs -I\$(top_srcdir)/include -I\$(top_srcdir) -Wall"
AC_SUBST(GST_CFLAGS, "$GST_EXT_CFLAGS $GST_INT_CFLAGS")
AC_SUBST(GST_LIBS, "$GST_EXT_LIBS $GST_INT_LIBS")