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-rw-r--r--pkgs/development/libraries/zeroc-ice/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/zeroc-ice/default.nix b/pkgs/development/libraries/zeroc-ice/default.nix
index ef16e381bcfd..f522c1810397 100644
--- a/pkgs/development/libraries/zeroc-ice/default.nix
+++ b/pkgs/development/libraries/zeroc-ice/default.nix
@@ -35,7 +35,7 @@ in stdenv.mkDerivation rec {
 
   NIX_CFLAGS_COMPILE = "-Wno-error=class-memaccess -Wno-error=deprecated-copy";
 
-  prePatch = lib.optional stdenv.isDarwin ''
+  prePatch = lib.optionalString stdenv.isDarwin ''
     substituteInPlace Make.rules.Darwin \
         --replace xcrun ""
   '';