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-rw-r--r--pkgs/applications/science/computer-architecture/timeloop/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/science/computer-architecture/timeloop/default.nix b/pkgs/applications/science/computer-architecture/timeloop/default.nix
index f559974ddaf53..4e794aaa29e24 100644
--- a/pkgs/applications/science/computer-architecture/timeloop/default.nix
+++ b/pkgs/applications/science/computer-architecture/timeloop/default.nix
@@ -43,7 +43,7 @@ stdenv.mkDerivation rec {
 
   #link-time optimization fails on darwin
   #see https://github.com/NixOS/nixpkgs/issues/19098
-  env.NIX_CFLAGS_COMPILE = lib.optional stdenv.isDarwin "-fno-lto";
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-fno-lto";
 
   postPatch = ''
     # use nix ar/ranlib