From 3d0c9ba59932643778f1bfa3d6adce2db72703d2 Mon Sep 17 00:00:00 2001
From: Robert Helgesson <robert@rycee.net>
Date: Mon, 5 Sep 2016 21:52:04 +0200
Subject: [PATCH] opencascade: fix build

---
 .../libraries/opencascade/default.nix           | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/pkgs/development/libraries/opencascade/default.nix b/pkgs/development/libraries/opencascade/default.nix
index 8a7f9970e657..51581bca382d 100644
--- a/pkgs/development/libraries/opencascade/default.nix
+++ b/pkgs/development/libraries/opencascade/default.nix
@@ -9,16 +9,25 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ cmake mesa tcl tk file libXmu qt4 freetype ];
 
-  preUnpack = ''
-    sourceRoot=`pwd`/ros/adm/cmake
-    cmakeFlags="$cmakeFlags -DINSTALL_DIR=$out -D3RDPARTY_TCL_DIR=${tcl} -D3RDPARTY_FREETYPE_DIR=${freetype.dev}"
-  '';
+  sourceRoot = "ros/adm/cmake";
+
+  cmakeFlags = [
+    "-D3RDPARTY_TCL_DIR=${tcl}"
+    "-D3RDPARTY_FREETYPE_DIR=${freetype.dev}"
+
+    # Not used on Linux but must be defined during configuration.
+    "-D3RDPARTY_FREETYPE_DLL=${freetype.dev}"
+  ];
 
   # https://bugs.freedesktop.org/show_bug.cgi?id=83631
   NIX_CFLAGS_COMPILE = "-DGLX_GLXEXT_LEGACY";
 
   hardeningDisable = [ "format" ];
 
+  preConfigure = ''
+    cmakeFlags="$cmakeFlags -DINSTALL_DIR=$out"
+  '';
+
   postInstall = ''
     mv $out/inc $out/include
     mkdir -p $out/share/doc/${name}