You receive this bug because this package does not respect my system's AR ( x86_64-pc-linux-gnu-ar - /usr/bin/x86_64-pc-linux-gnu-ar ) and calls directly ar - /usr/bin/ar The possible solutions to fix this issue are: 1)Fix the buildsystem, if you can 2)inherit toolchain-funcs and use tc-export AR 3)inherit toolchain-funcs and use emake AR="$(tc-getAR)" ar rv libmpdm.a mpdm_v.o mpdm_a.o mpdm_h.o mpdm_d.o mpdm_s.o mpdm_f.o mpdm_r.o mpdm_t.o gnu_regex.o ar rv libmpsl.a mpsl_c.o mpsl_l.o mpsl_m.o mpsl_y.o mpsl_f.o mpsl_d.o
+ 15 Mar 2013; Sergey Popov <pinkbyte@gentoo.org> mp-5.2.2.ebuild: + Respect AR, wrt bug #456150. Thanks to Agostino Sarubbo for discovering this + issue