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-rw-r--r--pkgs/development/libraries/cloog/default.nix2
-rw-r--r--pkgs/development/libraries/isl/0.12.2.nix2
-rw-r--r--pkgs/development/libraries/isl/default.nix2
3 files changed, 6 insertions, 0 deletions
diff --git a/pkgs/development/libraries/cloog/default.nix b/pkgs/development/libraries/cloog/default.nix
index da4501285e12..242af84eb908 100644
--- a/pkgs/development/libraries/cloog/default.nix
+++ b/pkgs/development/libraries/cloog/default.nix
@@ -14,6 +14,8 @@ stdenv.mkDerivation rec {
 
   configureFlags = [ "--with-isl=system" ];
 
+  enableParallelBuilding = true;
+
   doCheck = true;
 
   meta = {
diff --git a/pkgs/development/libraries/isl/0.12.2.nix b/pkgs/development/libraries/isl/0.12.2.nix
index f1da2c064092..67620881bca6 100644
--- a/pkgs/development/libraries/isl/0.12.2.nix
+++ b/pkgs/development/libraries/isl/0.12.2.nix
@@ -10,6 +10,8 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ gmp ];
 
+  enableParallelBuilding = true;
+
   meta = {
     homepage = http://www.kotnet.org/~skimo/isl/;
     license = stdenv.lib.licenses.lgpl21;
diff --git a/pkgs/development/libraries/isl/default.nix b/pkgs/development/libraries/isl/default.nix
index 7e08c8afe6f6..931ee831b734 100644
--- a/pkgs/development/libraries/isl/default.nix
+++ b/pkgs/development/libraries/isl/default.nix
@@ -11,6 +11,8 @@ stdenv.mkDerivation rec {
   buildInputs = [ gmp ];
   patches = [ ./fix-gcc-build.diff ];
 
+  enableParallelBuilding = true;
+
   meta = {
     homepage = http://www.kotnet.org/~skimo/isl/;
     license = stdenv.lib.licenses.lgpl21;