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-rw-r--r--pkgs/development/libraries/gsm/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/gsm/default.nix b/pkgs/development/libraries/gsm/default.nix
index 706bd769219..fb9ff8eb0fb 100644
--- a/pkgs/development/libraries/gsm/default.nix
+++ b/pkgs/development/libraries/gsm/default.nix
@@ -37,7 +37,7 @@ stdenv.mkDerivation rec {
   makeFlags = [
     "SHELL=${stdenv.shell}"
     "INSTALL_ROOT=$(out)"
-  ] ++ optional (stdenv.cc.cc.isClang or false) "CC=clang";
+  ] ++ optional stdenv.cc.isClang "CC=clang";
 
   preInstall = "mkdir -p $out/{bin,lib,man/man1,man/man3,include/gsm}";