diff --git a/Configurations/10-main.conf b/Configurations/10-main.conf
index 5b6480381..890970051 100644
--- a/Configurations/10-main.conf
+++ b/Configurations/10-main.conf
@@ -1507,15 +1507,18 @@ sub vc_wince_info {
         shared_ldflag    => "-dynamiclib",
         shared_extension => ".\$(SHLIB_MAJOR).\$(SHLIB_MINOR).dylib",
     },
+    # Option "freeze" such as -std=gnu9x can't negatively interfere
+    # with future defaults for below two targets, because MacOS X
+    # for PPC has no future, it was discontinued by vendor in 2009.
     "darwin-ppc-cc" => {
         inherit_from     => [ "darwin-common", asm("ppc32_asm") ],
-        cflags           => add("-arch ppc -DB_ENDIAN -Wa,-force_cpusubtype_ALL"),
+        cflags           => add("-arch ppc -std=gnu9x -DB_ENDIAN -Wa,-force_cpusubtype_ALL"),
         perlasm_scheme   => "osx32",
         shared_ldflag    => "-arch ppc -dynamiclib",
     },
     "darwin64-ppc-cc" => {
         inherit_from     => [ "darwin-common", asm("ppc64_asm") ],
-        cflags           => add("-arch ppc64 -DB_ENDIAN"),
+        cflags           => add("-arch ppc64 -std=gnu9x -DB_ENDIAN"),
         bn_ops           => "SIXTY_FOUR_BIT_LONG RC4_CHAR",
         perlasm_scheme   => "osx64",
         shared_ldflag    => "-arch ppc64 -dynamiclib",