restore x11 to pkg-config's list of default paths

[nolta]

You used to be able to install matplotlib with

$ brew install pkg-config
$ easy_install matplotlib

But 63415cc broke this, by removing /usr/X11/lib/pkgconfig from pkg-config's list of default paths. Setting PKG_CONFIG_PATH doesn't help, due to a bug in matplotlib's makefiles.

[jacknagel]

This was removed very deliberately, and is not the way to address this issue.

[nolta]

I know, i read the #12607 thread.

But given that brew doctor used to report

Error: Your pkg-config is not checking "/usr/X11/lib/pkgconfig" for packages.

it's not surprising that people came to rely on this behavior.

Would you consider a patch to brew doctor, stating that the behavior of pkg-config has changed, and that they might need to add

export PKG_CONFIG_PATH=/opt/X11/lib/pkgconfig:/usr/X11/lib/pkgconfig

to their .bashrc?

[jacknagel]

No, persistent warnings are bad. Users who don't care about this and don't set that variable will always see the warning.

[Sharpie]

Setting PKG_CONFIG_PATH doesn't help, due to a bug in matplotlib's makefiles.

Any progress on this front? Seems like the most direct resolution is for matplotlib to fix their bug.

[adamv]

Should be fixed upstream.

MacPorts packages matplotlib, but patches it to use proper folders: https://trac.macports.org/browser/trunk/dports/python/py-matplotlib/files/patch-setupext.py.diff