From 3ddead70852a5d484b063fec52973c56bad22601 Mon Sep 17 00:00:00 2001
From: Jan Tojnar <jtojnar@gmail.com>
Date: Mon, 30 Apr 2018 02:49:35 +0200
Subject: [PATCH] gmic: simplify the expression with placeholder

---
 pkgs/tools/graphics/gmic/default.nix | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/pkgs/tools/graphics/gmic/default.nix b/pkgs/tools/graphics/gmic/default.nix
index c267695dd78..51212a3ea94 100644
--- a/pkgs/tools/graphics/gmic/default.nix
+++ b/pkgs/tools/graphics/gmic/default.nix
@@ -32,16 +32,12 @@ in stdenv.mkDerivation rec {
     "-DBUILD_LIB_STATIC=OFF"
     "-DBUILD_PLUGIN=${if withGimpPlugin then "ON" else "OFF"}"
     "-DENABLE_DYNAMIC_LINKING=ON"
-  ];
+  ] ++ stdenv.lib.optional withGimpPlugin "-DPLUGIN_INSTALL_PREFIX=${placeholder "gimpPlugin"}/${gimp.targetPluginDir}";
 
   postPatch = ''
     cp ${CMakeLists} CMakeLists.txt
   '';
 
-  preConfigure = stdenv.lib.optionalString withGimpPlugin ''
-    cmakeFlags="$cmakeFlags -DPLUGIN_INSTALL_PREFIX=$gimpPlugin/${gimp.targetPluginDir}"
-  '';
-
   meta = with stdenv.lib; {
     description = "G'MIC is an open and full-featured framework for image processing";
     homepage = http://gmic.eu/;