diff --git a/pkgs/development/compilers/gcc/5/default.nix b/pkgs/development/compilers/gcc/5/default.nix
index d4692c777514..e95ef92c3f65 100644
--- a/pkgs/development/compilers/gcc/5/default.nix
+++ b/pkgs/development/compilers/gcc/5/default.nix
@@ -35,6 +35,7 @@
 , cloog # unused; just for compat with gcc4, as we override the parameter on some places
 , darwin ? null
 , buildPlatform, hostPlatform, targetPlatform
+, buildPackages
 }:
 
 assert langJava     -> zip != null && unzip != null
@@ -312,6 +313,7 @@ stdenv.mkDerivation ({
     ++ (optionals langJava [ boehmgc zip unzip ])
     ++ (optionals javaAwtGtk ([ gtk2 libart_lgpl ] ++ xlibs))
     ++ (optionals (targetPlatform != hostPlatform) [binutils])
+    ++ (optionals (buildPlatform != hostPlatform) [buildPackages.stdenv.cc])
     ++ (optionals langAda [gnatboot])
     ++ (optionals langVhdl [gnat])
 
@@ -449,6 +451,8 @@ stdenv.mkDerivation ({
         )
       }
       ${if langAda then " --enable-libada" else ""}
+      --build=${buildPlatform.config}
+      --host=${hostPlatform.config}
       --target=${targetPlatform.config}
       ${xwithArch}
       ${xwithCpu}