Is there any reason that using the clean-temp module does not AC_REQUIRE ([AC_SYS_LARGEFILE]) in the configure script? Without that, it is possible on some hosts that temporary files are artificially capped at 2GiB, even though enabling largefile support could make things behave otherwise. As a result, there is a regression in M4 1.4.8 (1.4.7 used the mkstemp module, but 1.4.8 switched to clean-temp).
-- Eric Blake
