It's the version mismatch error that was fixed for 2.16.1. It seems that it is still a problem for 2.14.2, however. Contents of /var/tmp/portage/gnome-session-2.14.2/temp/automake-1001.out: configure.in:4: version mismatch. This is Automake 1.10, configure.in:4: but the definition used by this AM_INIT_AUTOMAKE configure.in:4: comes from Automake 1.9.6. You should recreate configure.in:4: aclocal.m4 with aclocal and run automake again. Reproducible: Always Steps to Reproduce:
Fixed. Thanks for reporting.