This directory contains C libraries included with Astropy. Note that only C libraries without python-specific code should be included in this directory. Cython or C code intended for use with Astropy or wrapper code should be in the Astropy source tree.

The cfitsio directory only contains the small subset of files from CFITSIO which are required for the astropy.io.fits.hdu.compressed._tiled_compression package. All files are copied verbatim from CFITSIO and can easily be updated if needed.