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-rw-r--r--pkgs/applications/misc/st/default.nix5
1 files changed, 3 insertions, 2 deletions
diff --git a/pkgs/applications/misc/st/default.nix b/pkgs/applications/misc/st/default.nix
index bc70aad8da923..33924bdb7be50 100644
--- a/pkgs/applications/misc/st/default.nix
+++ b/pkgs/applications/misc/st/default.nix
@@ -13,8 +13,9 @@ stdenv.mkDerivation rec {
 
   inherit patches;
 
-  configFile = optionalString (conf!=null) (writeText "config.def.h" conf);
-  preBuild = optionalString (conf!=null) "cp ${configFile} config.def.h";
+  prePatch = optionalString (conf != null) ''
+    cp ${writeText "config.def.h" conf} config.def.h
+  '';
 
   nativeBuildInputs = [ pkgconfig ncurses ];
   buildInputs = [ libX11 libXft ] ++ extraLibs;