According to upstream NEWS:
"The configure option '--with-cairo' is no longer experimental."
Bug: https://bugs.gentoo.org/691830
Signed-off-by: Ulrich Müller <ulm@gentoo.org>
# Ulrich Müller <ulm@gentoo.org> (2016-10-15)
# The --with-cairo option is considered as experimental by upstream
# and causes problems with updating the X window, bug #592238
-app-editors/emacs cairo
-app-editors/emacs-vcs cairo
+app-editors/emacs:25 cairo
+app-editors/emacs:26 cairo
+app-editors/emacs-vcs:26 cairo
# Michał Górny <mgorny@gentoo.org> (2016-07-05)
# Mask system-clang support as it requires llvm-3.4 that is subject