net-wireless/libbtctl-0.8.1 uses autotools.eclass but does not specify which automake-version it needs. Adding these two lines before "inherit autotools" corrects this: WANT_AUTOMAKE="1.7" WANT_AUTOCONF="latest"
Thanks, added both with "latest" tho, as even ChangeLog says about automake-1.8 support and it works with 1.10 for me also.