astropy/package-template — pull request #85 by mdboom (2014-06-18 13:42:28+00:00)
Title: Clarify purpose of cextern directory.

This just copies over the language from `astropy` which never got updated over here.

A coworker creating an astropy affiliated package was recently tripped up by this.

This is important for Linux packagers, who generally like to remove `cextern` altogether and build with system packages, but should not be removed C extensions (wrappers) that are specific to the affiliated package itself.