I just had a very long chase for a new build error that began after a recent gnulib upgrade. Briefly, the symptoms were that an invocation of curl-config --libs was returning nothing when run by configure on systems with older curls. curl-config is a shell script, which calls pkg-config libcurl --libs and running either of those commands on the command line worked fine. The end of the story is that gnulib's getopt.m4 now sets POSIXLY_CORRECT in perpetuity, and as a result pkg-config interprets "--libs" as a library to search for (and fails to find it), rather than as a long option.
I re-updated my gnulib repository, and I don't see any changes to this file, so I'm assuming that the bug is still present. I will look for a fix and send a patch, but I thought I would poll for corroboration or any other information that I don't see in the archives. Dustin -- Open Source Storage Engineer http://www.zmanda.com