egag@darkstar:~$ grep pkg-config /var/log/packages/*
/var/log/packages/pkgconfig-0.15.0-i486-1
kgconfig: pkg-config is a system for managing library compile/link flags
/var/log/packages/pkgconfig-0.15.0-i486-1
kgconfig: page that comes with pkg-config for full documentation.
/var/log/packages/pkgconfig-0.15.0-i486-1:usr/bin/pkg-config
/var/log/packages/pkgconfig-0.15.0-i486-1:usr/man/man1/pkg-config.1.gz
guess you need to ( re-) install /pkgconfig-0.15.0-i486-1
egag