Parallel build is broken

[dangitall]

Something happened recently such that sometimes if you try to invoke a parallel build (make -j) it will rerun ./configure even if it isn't required. I'm sure it has something to do with the autoconf checks that happen in the beginning.

[jonm]

I did see this once (rerunning ./configure) when trying this out, but now can't reproduce it. At one point I redid all the autotool stuff:

make distclean
aclocal
autoconf
autoheader
automake --add-missing

and now make -j seems to work unsurprisingly.