On Sat, Feb 9, 2013 at 12:45 PM, Jed Brown <jed@59a2.org> wrote:

Doesn't the 'make install' also overwrite all the headers, implying that all of moose will also rebuild even if the change in libmesh was restricted to a *.C file (thus requiring at most re-linking)? Gosh, that doesn't sound fun.

http://stackoverflow.com/questions/6710306/autotools-install-headers-only-when-newer

Haven't tried it myself, but looks promising.