superfluous GNUism in the makefile

Taylor R Campbell <[email protected]>
Newsgroups gmane.lisp.scheme.scheme48
Message-ID <[email protected]> 
The rule for the SRFI 27 library in Scheme48's makefile refers to the
GNU-specific `$^' variable.  Since there is only one source file to
which it refers by that variable, you can just substitute `$<', which
is in POSIX.

The inclusion of build/filenames.make is also a GNUism, but it doesn't
matter as much because it's necessary only for developers, not for
users.
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