jcupitt/libvips — pull request #171 by lovell (2014-09-08 18:05:26+00:00)
Title: Prevent the version of autotools in Redhat/Centos 6 generating empty else statements

Even the venerable _bitcoin_ project has run into this one - see https://github.com/bitcoin/bitcoin/commit/5d5b0d284a787fc9a3c53c59232ebc2c09dffaeb - their commit message suggests this may have affected _MinGW_ also.