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-rw-r--r--nixpkgs/pkgs/development/tools/build-managers/cmake/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/tools/build-managers/cmake/default.nix b/nixpkgs/pkgs/development/tools/build-managers/cmake/default.nix
index 2de586f97cbf..a29ac38eb136 100644
--- a/nixpkgs/pkgs/development/tools/build-managers/cmake/default.nix
+++ b/nixpkgs/pkgs/development/tools/build-managers/cmake/default.nix
@@ -102,7 +102,7 @@ stdenv.mkDerivation rec {
   ];
 
   # make install attempts to use the just-built cmake
-  preInstall = lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) ''
+  preInstall = lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) ''
     sed -i 's|bin/cmake|${buildPackages.cmakeMinimal}/bin/cmake|g' Makefile
   '';