build of thunderbird-lightning-3.3-5 failed on an epel7 ppc64le local environment using a RHEL7.2 snapshot of the 15th of october 2015. configure: error: cannot guess build type; you must specify one This happened because of following line in the spec: # Update the various config.guess to upstream release for aarch64 support find ./ -name config.guess -exec cp /usr/lib/rpm/config.guess {} ';' Because of the rpm-4.11.3-17 package version on redhat, /usr/lib/rpm/config.guess and config.sub comming from rpm package are not set correctly for ppc64le and these files can not be used directly. Note that /usr/lib/rpm/redhat/config... handle ppc64le correctly.
thunderbird 38, which has been released as an errata for both RHEL and CentOS, will obsolete thunderbird-lightning. Therefore, AFAICS epel7 thunderbird-lightning should be retired.
Indeed. Done.