> Sure.  The problem has to do with the expansion of the $< macro.  For
> the HP-UX make, $< is evaluated only for inference rules.  For GNU make,
> $< is evaluated for both target and inference rules.  At least one of
> mutt's Makefiles (I don't remember offhand which one) has a target rule
> that uses sed and $<.  GNU make expands this $< to the source file name,
> as the Makefile's author intended, and the build works fine.  When the
> HP-UX make gets to this point, however, it replaces $< with an empty
> string which then leaves sed waiting for input from stdin and the build
> hangs.

 That was in m4/Makefile.*, and it's has been fixed for a while now.

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