#54 remove "$<" from explicit targets & support build dirs

[Dan Nelson]

Some make's can't handle $< in explicit makefile
targets, and of those that can, some can't handle them
when builddir != srcdir. This patch converts $< to
$(srcdir)/srcfile.in .

[Dan Nelson]

[Joe Allen]

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Thanks, I've taken the patch (JOE in CVS has been updated).