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* Don't update homebrew

Resolution option 2-1 for https://github.com/matthew-brett/multibuild/issues/116

Add libtool, flex, and bison.

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

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

* Don't update homebrew

Resolution option 2-1 for https://github.com/matthew-brett/multibuild/issues/116

Add libtool, flex, and bison.

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

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

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

* ENH: libraries: add a build_github function

* FIX: use name stamp

* MAINT: remove noop

* [tst:library_builders] add build_github