Astronomers often need to relate positions on an image of the sky to
positions on the real sky to identify catalogued objects in images,
tell other people where to look to find an identified object, or to
compute motions of planets, satellites, asteroids, or comets. WCSTools
is a package of programs and a library of utility subroutines for
setting and using the world coordinate systems (WCS) in the headers of
the most common astronomical image formats, FITS and IRAF .imh, to
relate image pixels to sky coordinates.
The Gentoo package is using GNU autotools to produce portable shared
and static libraried.