grep HOMEPAGE /usr/portage/eclass/xorg-2.eclass shows that all packages will use HOMEPAGE=https://www.x.org/wiki/ which is not usefull for any package. I tried to find information about x11-misc/gccmakedep with out success. I suggest to drop this variable and set it to the newer https://wiki.gentoo.org/wiki/No_homepage if there is nothing better. On the wiki is no information about x11-misc/gccmakedep for example.
I would suggest: HOMEPAGE="https://www.x.org/wiki/ https://cgit.freedesktop.org/" Many (maybe all?) X packages https://cgit.freedesktop.org/. There you can find e.g. https://cgit.freedesktop.org/xorg/util/gccmakedep/
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=9b760f36bc60ff752afa8394fae3290b5d01ea9b commit 9b760f36bc60ff752afa8394fae3290b5d01ea9b Author: Matt Turner <mattst88@gentoo.org> AuthorDate: 2018-05-26 20:51:56 +0000 Commit: Matt Turner <mattst88@gentoo.org> CommitDate: 2018-05-26 20:52:28 +0000 xorg-2.eclass: Put https://cgit.freedesktop.org/ in HOMEPAGE Closes: https://bugs.gentoo.org/624498 Closes: https://bugs.gentoo.org/623782 eclass/xorg-2.eclass | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)