--- a/.mozconfig	2019-01-21 09:21:00.221010326 +0100
+++ b/.mozconfig	2019-01-21 09:22:02.477911431 +0100
@@ -6,12 +6,11 @@
 ac_add_options --enable-optimize
 ac_add_options --enable-rust-simd
 ac_add_options --enable-lto
-export MOZ_PGO=1
-export CC=clang
-export CXX=clang++
-export AR=llvm-ar
-export NM=llvm-nm
-export RANLIB=llvm-ranlib
+export CC=gcc
+export CXX=g++
+export AR=gcc-ar
+export NM=gcc-nm
+export RANLIB=gcc-ranlib
 
 # Branding
 ac_add_options --enable-official-branding