Hi,

I'm unable to get libtool 2.4.3 to build universally on OS X. It fails
while calling lipo while attempting to build libltdl.la.

It looks like the `find` here is returning no files, which results in lipo
being called with an output file but no input files:
http://git.savannah.gnu.org/cgit/libtool.git/tree/build-aux/ltmain.in?id=5627a7f498e07a40b970c3a5ab5e74a5053e956f#n3243

This occurs when attempting to build universal i386/x86_64 for OS X 10.6
through 10.10, so it doesn't seem to be confined to a particular OS verison.

I've attached verbose build logs (with silent rules disabled); they're also
accessible online here: https://gist.github.com/9a4212e9f453dfcc813a

Best,
Misty De Meo