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-rw-r--r--pkgs/development/libraries/science/math/magma/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/science/math/magma/default.nix b/pkgs/development/libraries/science/math/magma/default.nix
index c428fbab588b..ef4e89aecb84 100644
--- a/pkgs/development/libraries/science/math/magma/default.nix
+++ b/pkgs/development/libraries/science/math/magma/default.nix
@@ -22,7 +22,7 @@ in stdenv.mkDerivation {
 
   doCheck = false;
 
-  MKLROOT = optionalString mklSupport "${mkl}";
+  MKLROOT = optionalString mklSupport mkl;
 
   enableParallelBuilding=true;
   buildFlags = [ "magma" "magma_sparse" ];