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-rw-r--r--pkgs/development/compilers/mlton/from-git-source.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/pkgs/development/compilers/mlton/from-git-source.nix b/pkgs/development/compilers/mlton/from-git-source.nix
index ec0b96bbf23a3..b91e6c7480da6 100644
--- a/pkgs/development/compilers/mlton/from-git-source.nix
+++ b/pkgs/development/compilers/mlton/from-git-source.nix
@@ -21,6 +21,9 @@ stdenv.mkDerivation {
 
   buildInputs = [mltonBootstrap gmp];
 
+  # build fails otherwise
+  enableParallelBuilding = false;
+
   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