diff -r 000000000000 -r 6474c204b198 build/autoconf/wrapper.m4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/autoconf/wrapper.m4	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+dnl This Source Code Form is subject to the terms of the Mozilla Public
+dnl License, v. 2.0. If a copy of the MPL was not distributed with this
+dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+dnl =======================================================================
+dnl = Enable compiling with various compiler wrappers (distcc, ccache, etc)
+dnl =======================================================================
+AC_DEFUN([MOZ_CHECK_COMPILER_WRAPPER],
+[
+MOZ_ARG_WITH_STRING(compiler_wrapper,
+[  --with-compiler-wrapper[=path/to/wrapper]
+    Enable compiling with wrappers such as distcc and ccache],
+    COMPILER_WRAPPER=$withval, COMPILER_WRAPPER="no")
+
+if test "$COMPILER_WRAPPER" != "no"; then
+    case "$CC" in
+    $COMPILER_WRAPPER\ *)
+        :
+        ;;
+    *)
+        CC="$COMPILER_WRAPPER $CC"
+        CXX="$COMPILER_WRAPPER $CXX"
+        _SUBDIR_CC="$CC"
+        _SUBDIR_CXX="$CXX"
+        ac_cv_prog_CC="$CC"
+        ac_cv_prog_CXX="$CXX"
+        MOZ_USING_COMPILER_WRAPPER=1
+        ;;
+    esac
+fi
+
+AC_SUBST(MOZ_USING_COMPILER_WRAPPER)
+])