Alex Kanavin

If PYTHONPATH is set from the build environment outside of make (which is the case for us), then make no longer treats it as an internal variable, and reexports the value into the environment of the processes it starts. You can easily see this with the following makefile: BOGUS = bogusvalue test: env And then: alex@alex-lx-laptop:~$ make test|grep BOGUS alex@alex-lx-laptop:~$ BOGUS=notbogus make test|grep BOGUS BOGUS=bogusvalue