diff -r 000000000000 -r 6474c204b198 build/unix/mozconfig.linux32
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/unix/mozconfig.linux32	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+. "$topsrcdir/build/unix/mozconfig.linux"
+
+if test `uname -m` = "x86_64"; then
+  # -march=pentiumpro is what our 32-bit native toolchain defaults to
+  CC="$CC -m32 -march=pentiumpro"
+  CXX="$CXX -m32 -march=pentiumpro"
+  ac_add_options --target=i686-pc-linux
+  ac_add_options --host=i686-pc-linux
+  ac_add_options --x-libraries=/usr/lib
+  export PKG_CONFIG_LIBDIR=/usr/lib/pkgconfig:/usr/share/pkgconfig
+fi