apr (Apache Portable Runtime) includes it's own libtool that doesn't play nice with Gentoo. emerge dev-libs/apr /usr/bin/apr-config --apr-libtool # most things that compile against apr use this An example package is apr_memcache, a C API using apr for memcache. Compiling this package gives: libtool: compile: unable to infer tagged configuration libtool: compile: specify a tag with `--tag' I fixed this by: cd /usr/share/apr-0/build mv libtool libtool.old ln -s /usr/bin/libtool libtool Using the stock libtool works. ebuild for dev-util/apr needs tweaking to remove the built in libtool.
*** This bug has been marked as a duplicate of 81260 ***