> But none of this is meant to suggest that there isn't actually some real > change in aclocal behaviour which is causing the results you are seeing.
I've failed to find any regression. As I said, if I install 1.16.5 into a test --prefix and run ntp's bootstrap with that prefix, it cannot find libtool either. Isn't that conclusive? Similarly, if the automake pretest and libtool are installed into the same prefix, then libtool is found. -k