--try-toolchain -r and --job together causes problems

[mstud]

Hi, I'm trying to build WPS-3.8.0-intel-2016a-dmpar.eb but wish to use a custom toolchain. All the dependencies have already been installed, but now when I try to build WPS itself with --job, I get the following error in the build log:

== 2017-04-21 09:44:07,345 build_log.py:147 ERROR EasyBuild crashed with an error (at ?:124 in init): zlib/1.2.8-GCCcore-5.3.0(15):ERROR:150: Module 'zlib/1.2.8-GCCcore-5.3.0' conflicts with the currently loaded module(s) 'zlib/1.2.8-intel-2016.03-GCC-5.3' (at easybuild/tools/modules.py:694 in run_module)

When I do it without --job, the build completes successfully. Not sure what is causing this, my tmpdir lies in a shared file system, but apparently the dependency resolution works differently within a job and somehow wants to load zlib without a rewritten toolchain version.