Created attachment 506812 [details] build.log.gz net-dns/libidn-1.33-r2 fails to build due to missing build dependency
Created attachment 506814 [details] emerge --info
package builds correctly after merging the dev-util/gengetopt-2.22.6 package
*** This bug has been marked as a duplicate of bug 638952 ***
I can confirm this bug. I suggest adding dev-util/gengetopt to the variable COMMON_DEPEND in an -r3 revision of the ebuild. As it pulls in the required dev-util/gengetopt, this resolves the problem.
No, that's not a duplicate. The build system checks for Makefile.am updates for some targets which is kind of silly.