Created attachment 514622 [details] build log astropy-2.0.1 requires several packages to build which are currently only added when USE=doc is set. Missing dependencies I have encountered are: dev-python/fitsio sci-astronomy/erfa sci-astronomy/wcslib Build fails due to missing include files (see attached example build log). Installing the packages manually fixes the build failures.
I think the dependencies are missing upstream in the package definition too. https://github.com/astropy/astropy