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-rw-r--r--nixpkgs/pkgs/development/interpreters/erlang/R21.nix4
-rw-r--r--nixpkgs/pkgs/development/interpreters/erlang/generic-builder.nix3
2 files changed, 4 insertions, 3 deletions
diff --git a/nixpkgs/pkgs/development/interpreters/erlang/R21.nix b/nixpkgs/pkgs/development/interpreters/erlang/R21.nix
index b787f3f44f54..28166dfc0b0a 100644
--- a/nixpkgs/pkgs/development/interpreters/erlang/R21.nix
+++ b/nixpkgs/pkgs/development/interpreters/erlang/R21.nix
@@ -1,8 +1,8 @@
 { mkDerivation }:
 
 mkDerivation rec {
-  version = "21.2";
-  sha256 = "0v9smdp2vxkpsz65a6ypwzl12fqdfrsi7k29f5i7af0v27r308cm";
+  version = "21.2.3";
+  sha256 = "1v47c7bddbp31y6f8yzdjyvgcx9sskxql33k7cs0p5fmr05hhxws";
 
   prePatch = ''
     substituteInPlace configure.in --replace '`sw_vers -productVersion`' '10.10'
diff --git a/nixpkgs/pkgs/development/interpreters/erlang/generic-builder.nix b/nixpkgs/pkgs/development/interpreters/erlang/generic-builder.nix
index 0529c9f1e28c..bc0b728ecce4 100644
--- a/nixpkgs/pkgs/development/interpreters/erlang/generic-builder.nix
+++ b/nixpkgs/pkgs/development/interpreters/erlang/generic-builder.nix
@@ -59,7 +59,8 @@ in stdenv.mkDerivation ({
 
   debugInfo = enableDebugInfo;
 
-  enableParallelBuilding = true;
+  # On some machines, parallel build reliably crashes on `GEN    asn1ct_eval_ext.erl` step
+  enableParallelBuilding = false;
 
   # Clang 4 (rightfully) thinks signed comparisons of pointers with NULL are nonsense
   prePatch = ''