in py-angr is linked to an _unversioned_ .so from py-unicorn. LIB_DEPENDS without an associated WANTLIB is incorrect, the LIB_DEPENDS is stripped so py-unicorn is not recorded as a dep in here. and WANTLIB requires a versioned .so file. convert to BUILD+RUN_DEPENDS, it's not 100% correct either but the only sane way.