The new version released 2012-06-03 depends on sys-devel/llvm-3.1 also fixed "Memory manager provides non 16-bits aligned pointers" => "...which triggers crashes with SSE."
Thank-you for the report, this is now bumped in CVS. + 07 Jun 2012; Michael Palimaka <kensington@gentoo.org> + +files/opengtl-0.9.17-gcc-4.7.patch, +files/opengtl-0.9.17-ldflags.patch, + +opengtl-0.9.17.ebuild: + Version bump wrt bug #419977. Drop unused dep on zlib. Respect LDFLAGS when + tests are enabled. Add patch from Fedora to fix build with GCC 4.7.