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* 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.

* [library_builders] use brew to install openblas

Yields better performance on OSX

* [tst:library_builders] add openblas

* [tst:library_builders] update homebrew

* fix bash

* [library_builders] force openblas link

* [tst:multibuild] run library_builders in manylinux

* [tst:multibuild] fix

* [tst:multibuild] source linux steps

* [travis] require sudo on linux

* [tst:multlibuild] touch config

* [travis] drop sudo for precise

* [tst:multibuld] cleanup

* [tst:multibuild] check for docker

* [tst:multibuild] fix docker check

* [tst:multibuild] drop docker

* [tst:multibuild] fix command

* [osx] don't update homebrew

* [docker] move activate_ccache until after utils are loaded

* [manylinux_utils] create cccache directory

* [manylinux_utils] fix case

* [osx/ccache] disable maxsize

* [osx_utils] move  code and add comment