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-rw-r--r--pkgs/applications/science/math/calculix/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/science/math/calculix/default.nix b/pkgs/applications/science/math/calculix/default.nix
index 4b0ae6f8ac9..2d2fb0a92d9 100644
--- a/pkgs/applications/science/math/calculix/default.nix
+++ b/pkgs/applications/science/math/calculix/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ arpack spooles blas lapack ];
 
-  NIX_CFLAGS_COMPILE = [
+  NIX_CFLAGS_COMPILE = toString [
     "-I${spooles}/include/spooles"
     "-std=legacy"
   ];