1 files changed, 4 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/compilers/mlton/from-git-source.nix b/nixpkgs/pkgs/development/compilers/mlton/from-git-source.nix
index 2585b599caf..ec0b96bbf23 100644
--- a/nixpkgs/pkgs/development/compilers/mlton/from-git-source.nix
+++ b/nixpkgs/pkgs/development/compilers/mlton/from-git-source.nix
@@ -6,6 +6,7 @@
 , sha256
 , stdenv
 , version
+, which
 }:
 
 stdenv.mkDerivation {
@@ -16,10 +17,13 @@ stdenv.mkDerivation {
     inherit url rev sha256;
   };
 
+  nativeBuildInputs = [ which ];
+
   buildInputs = [mltonBootstrap gmp];
 
   preBuild = ''
     find . -type f | grep -v -e '\.tgz''$' | xargs sed -i "s@/usr/bin/env bash@$(type -p bash)@"
+    sed -i "s|/tmp|$TMPDIR|" bin/regression
 
     makeFlagsArray=(
       MLTON_VERSION="${version} ${rev}"