Attempting to update to x11-libs/gtk+-2.24.23 from x11-libs/gtk+-2.24.22 was failing in the autoconf phase. On investigation I discovered that the installed version of dev-util/gtk-doc-am-1.19 was not providing adequate/expected symbols for autoconf (and is no longer in Portage). Upgrading dev-util/gtk-doc-am-1.20 (latest) resolved the issue. The ebuild currently specifies >gtk-doc-am-1.11. It seems that should now be >gtk-doc-am-1.19.
Can you provide the logs with the failure?
Created attachment 376122 [details] gtk+-2.24.23 build.log
Created attachment 376124 [details] gtk+-2.24.23 automake-1.out
Created attachment 376126 [details] emerge info
Just to clarify, upgrading from dev-util/gtk-doc-am-1.19 to dev-util/gtk-doc-am-1.20 resolved the issue. The original bug title reflected this.
+ 02 May 2014; Pacho Ramos <pacho@gentoo.org> gtk+-2.24.23.ebuild, + gtk+-3.10.8.ebuild: + Fix gtk-doc dep (#509118 by Chris Williams) +