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It appears that is_function actually
calls the function (debugged). Why
that happens is a mystery to me, but
this should ensure that the spinner
runs as it is supposed to rather than
waiting until pre_build is complete.

See https://github.com/travis-ci/travis-ci/issues/8703#issuecomment-348866918

* Allow to specify a custom $CONFIG_PATH

* need to also pass  to the docker container

Add libtool, flex, and bison.

flex must be fetched from the released archive, rather
than the GitHub autogenerated source.

The archives directory was not created. I tested this downstream and the fix worked.

Fetch OpenBLAS from wheels.scipy.org rather than building it.

* Revert "Revert "[osx_steps] export cppflags""

This reverts commit 7956064f.

* Try using LIBRARY_PATH instead of LDFLAGS

Revert "Customize Docker build image"

Customize Docker build image

Fix "cd" overridden by RVM.
Don't try to uninstall virtualenv if pip is not installed.

This was accidentally committed.

Added pypy 5.8 and 5.9

Updated pypy versions

[common] improve spinner UI

Spinner: UI cleanup

Keep alive: disable w/out env

Revert "[osx_steps] export cppflags"

This reverts commit 4f303070.

Prefer multibuild library locations over the defaults.
Sometimes multibuild would use an older version
over it's own.