prefix - prefix: Fix 8.1 detection and build system, bite the 1.0 bullet

Log Message:
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Fix 8.1 detection and build system, bite the 1.0 bullet

Modified Files:
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prefix:
Makefile (r1.10 -> r1.11)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/prefix/prefix/Makefile?r1=1.10&r2=1.11)
prefix.c (r1.48 -> r1.49)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/prefix/prefix/prefix.c?r1=1.48&r2=1.49)
prefix/debian:
changelog (r1.6 -> r1.7)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/prefix/prefix/debian/changelog?r1=1.6&r2=1.7)