diff --git a/configure.in b/configure.in
index 0e3184f957..96a9d16796 100644
--- a/configure.in
+++ b/configure.in
@@ -333,6 +333,13 @@ AC_ARG_ENABLE(debug,
    esac])
 AC_SUBST(PROD_BUILD_FLG)
 
+dnl Avoid dumb '-g -O2' autoconf's default
+dnl Debugging information and optimization flags should be set in prefix.$platform file
+dnl Should be replaced with AC_PROG_GCC_DEFAULT_FLAGS() when available
+if test "$CFLAGS" = "-g -O2" -o "$CFLAGS" = "-g" -o "$CFLAGS" = "-O2"; then
+	CFLAGS=
+fi
+
 dnl Find out how to use threads on this platform
 pre_acx_pthread_cflags=$CFLAGS
 ACX_PTHREAD([