Some application like ash required libbsd.a to be there. But the libbsd-compat.a is kind of the same. It would be nice that a symbolic link to that library be created so that package like ash would compile nicely out of the box. cd /usr/lib ln libbsd-compat.a libbsd.a Or something like that to be added to glibc ebuild, install section.
added in glibc-2.2.4-r9