According to headers in source files, openmesh is distributed under the LGPL, version 3 or later, with a linking exception (equivalent to "LGPL-3-with-linking-exception", but with slightly different wording).
Done, thanks for reporting. 11 Jan 2013; Justin Bronder <jsbronder@gentoo.org> openmesh-2.0_rc5.ebuild, openmesh-2.1.ebuild, openmesh-2.2.ebuild: Fix license for >=2.0_rc5. #450304