blender: Optionally enable numpy support

This is required by some included addons (such as ANT landscape). Note
that we can't use -DWITH_PYTHON_INSTALL_NUMPY=ON because it's
conditional on -DWITH_PYTHON_INSTALL=ON.

pkgs/applications/misc/blender/default.nix

@@ -1,15 +1,18 @@
 { stdenv, lib, fetchurl, boost, cmake, ffmpeg, gettext, glew
 , ilmbase, libXi, libX11, libXext, libXrender
 , libjpeg, libpng, libsamplerate, libsndfile
-, libtiff, libGLU_combined, openal, opencolorio, openexr, openimageio, openjpeg_1, python
+, libtiff, libGLU_combined, openal, opencolorio, openexr, openimageio, openjpeg_1, pythonPackages
 , zlib, fftw, opensubdiv, freetype, jemalloc, ocl-icd
 , jackaudioSupport ? false, libjack2
 , cudaSupport ? false, cudatoolkit
 , colladaSupport ? true, opencollada
+, enableNumpy ? false, makeWrapper
 }:
 
 with lib;
 
+let python = pythonPackages.python; in
+
 stdenv.mkDerivation rec {
   name = "blender-2.79b";
 
@@ -24,6 +27,7 @@ stdenv.mkDerivation rec {
       freetype libjpeg libpng libsamplerate libsndfile libtiff libGLU_combined openal
       opencolorio openexr openimageio openjpeg_1 python zlib fftw jemalloc
       (opensubdiv.override { inherit cudaSupport; })
+      makeWrapper
     ]
     ++ optional jackaudioSupport libjack2
     ++ optional cudaSupport cudatoolkit
@@ -70,6 +74,12 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
+  postInstall = optionalString enableNumpy
+    ''
+      wrapProgram $out/bin/blender \
+        --prefix PYTHONPATH : ${pythonPackages.numpy}/lib/python${python.majorVersion}/site-packages
+    '';
+
   meta = with stdenv.lib; {
     description = "3D Creation/Animation/Publishing System";
     homepage = https://www.blender.org;

pkgs/top-level/all-packages.nix

@@ -14904,7 +14904,7 @@ with pkgs;
 
   blender = callPackage  ../applications/misc/blender {
     cudaSupport = config.cudaSupport or false;
-    python = python35;
+    pythonPackages = python35Packages;
     stdenv = overrideCC stdenv gcc6;
   };