Thanks for looking into this.
Is there some way we can do this without requiring AC_CANONICAL_HOST? We're close to a release for Autoconf, and requiring this at the last minute for AC_SYS_LARGEFILE is a bit of a stretch.+[AC_REQUIRE([AC_CANONICAL_HOST])
That is, instead of AS_CASE([$host_os], ...) can we use AC_PREPROC_IFELSE with the appropriate C preprocessor tests? Or perhaps do the AC_REQUIRE only if gl_LARGEFILE is defined?
