diff --git a/pkgs/development/compilers/gcc/3.4/default.nix b/pkgs/development/compilers/gcc/3.4/default.nix
index 1595b7f336f..1be771ac705 100644
--- a/pkgs/development/compilers/gcc/3.4/default.nix
+++ b/pkgs/development/compilers/gcc/3.4/default.nix
@@ -37,7 +37,7 @@ stdenv.mkDerivation {
     }
   ";
 
-  passthru = { inherit langC langCC langF77; };
+  passthru = { inherit langC langCC langF77; isGNU = true; };
 
   meta = {
     homepage = "http://gcc.gnu.org/";
diff --git a/pkgs/development/compilers/gcc/4.3/default.nix b/pkgs/development/compilers/gcc/4.3/default.nix
index 45040c2f375..3db8ee5f3ea 100644
--- a/pkgs/development/compilers/gcc/4.3/default.nix
+++ b/pkgs/development/compilers/gcc/4.3/default.nix
@@ -171,6 +171,8 @@ stdenv.mkDerivation ({
     rm -Rf ghdl-*
   '';
 
+  passthru.isGNU = true;
+
   meta = {
     homepage = "http://ghdl.free.fr/";
     license = stdenv.lib.licenses.gpl2Plus;
diff --git a/pkgs/development/compilers/gcc/4.4/default.nix b/pkgs/development/compilers/gcc/4.4/default.nix
index c78de2265f3..47c8c86a95d 100644
--- a/pkgs/development/compilers/gcc/4.4/default.nix
+++ b/pkgs/development/compilers/gcc/4.4/default.nix
@@ -243,7 +243,7 @@ stdenv.mkDerivation ({
 
 
   passthru = { inherit langC langCC langAda langFortran langVhdl
-      enableMultilib version; };
+      enableMultilib version; isGNU = true; };
 
   # ghdl does not build fine with parallel building
   # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46173
diff --git a/pkgs/development/compilers/gcc/4.5/default.nix b/pkgs/development/compilers/gcc/4.5/default.nix
index 931c5c413de..c4be4f266dd 100644
--- a/pkgs/development/compilers/gcc/4.5/default.nix
+++ b/pkgs/development/compilers/gcc/4.5/default.nix
@@ -358,7 +358,7 @@ stdenv.mkDerivation ({
     else null;
 
   passthru = { inherit langC langCC langAda langFortran langVhdl
-      enableMultilib version; };
+      enableMultilib version; isGNU = true; };
 
   enableParallelBuilding = !langAda;
 
diff --git a/pkgs/development/compilers/gcc/4.6/default.nix b/pkgs/development/compilers/gcc/4.6/default.nix
index 78666c8cdce..0f65a89bd20 100644
--- a/pkgs/development/compilers/gcc/4.6/default.nix
+++ b/pkgs/development/compilers/gcc/4.6/default.nix
@@ -427,7 +427,7 @@ stdenv.mkDerivation ({
     else null;
 
   passthru = { inherit langC langCC langAda langFortran langVhdl
-      langGo version; };
+      langGo version; isGNU = true; };
 
   enableParallelBuilding = false;
 
diff --git a/pkgs/development/compilers/llvm/3.3/clang.nix b/pkgs/development/compilers/llvm/3.3/clang.nix
index aeaa476df12..0e8fd29dc9e 100644
--- a/pkgs/development/compilers/llvm/3.3/clang.nix
+++ b/pkgs/development/compilers/llvm/3.3/clang.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation {
       sha256 = "15mrvw43s4frk1j49qr4v5viq68h8qlf10qs6ghd6mrsmgj5vddi";
   };
 
-  passthru = { cc = stdenv.cc.cc; };
+  passthru = { cc = stdenv.cc.cc; gcc = gccReal; };
 
   meta = {
     homepage = http://clang.llvm.org/;
diff --git a/pkgs/development/compilers/llvm/3.4/clang.nix b/pkgs/development/compilers/llvm/3.4/clang.nix
index 612e63eafd4..4c962cb2d26 100644
--- a/pkgs/development/compilers/llvm/3.4/clang.nix
+++ b/pkgs/development/compilers/llvm/3.4/clang.nix
@@ -35,6 +35,9 @@ stdenv.mkDerivation {
   '';
 
   passthru.cc = stdenv.cc.cc;
+  # GCC_INSTALL_PREFIX points here, so just use it even though it may not
+  # actually be a gcc
+  passthru.gcc = stdenv.cc.cc;
 
   enableParallelBuilding = true;
 
diff --git a/pkgs/development/tools/misc/distcc/default.nix b/pkgs/development/tools/misc/distcc/default.nix
index f73f47ab87b..0b42b88ef7a 100644
--- a/pkgs/development/tools/misc/distcc/default.nix
+++ b/pkgs/development/tools/misc/distcc/default.nix
@@ -41,7 +41,7 @@ let
       #
       # extraConfig is meant to be sh lines exporting environment
       # variables like DISTCC_HOSTS, DISTCC_DIR, ...
-      links = extraConfig : (runCommand "distcc-links" { }
+      links = extraConfig: (runCommand "distcc-links" { passthru.gcc = gcc.cc; }
         ''
           mkdir -p $out/bin
           if [ -x "${gcc.cc}/bin/gcc" ]; then