Current installation of sci-libs/cfitsio-4.2.0 compiles but the removes libcfitsio.a static library during the installation by the following line in ebuild function multilib_src_install_all() { ..... # Remove static libs find "${ED}" -name '*.a' -delete || die } At least in my case, static library is required to compile a third party astrophysics software ( https://healpix.sourceforge.io ) against system cfitsio. Could this be optionally controlled by USE='static-libs' USE flag that many other library packages have ? This issue was raised back in 2008 in bug #224225, which was marked as resolved by restoring static libraries in cfitsio installation. However they disappeared again since.