See http://mdcc.cx/csbs/csbs-wd/csbs.html#creating_a_source_package_from_a_tarball !

joostvb@pong:~/local/src/caspar% wget http://mdcc.cx/pub/caspar/caspar-20050302.tar.gz
joostvb@pong:~/local/src/caspar% wget http://mdcc.cx/pub/caspar/caspar-20050302.tar.gz.asc

joostvb@pong:~/local/src/caspar% tar zxf caspar-20050302.tar.gz
joostvb@pong:~/local/src/caspar% mv caspar-20050424 caspar-20050424.orig
joostvb@pong:~/local/src/caspar% tar zxf caspar-20050424.tar.gz
joostvb@pong:~/local/src/caspar% mkdir caspar-20050424/solaris

joostvb@topaz:~/arch/csbs% tla update

joostvb@pong:~/.csbs% for f in bootstrap csbs.m4 makeMakefile; do wget http://mdcc.cx/csbs/csbs-wd/$f; done

joostvb@nagy:~/cv...n.org/caspar/solaris/pkg% cvs commit -m 'new upstream' Makefile.m4 README.Solaris 

joostvb@topaz:~/cv...ebian.org/caspar/solaris% cvs update

joostvb@pong:~/lo.../caspar-20050302/solaris% for f in Makefile.m4 README.Solaris bootstrap pkginfo.in prototype; do wget http://mdcc.cx/~joostvb/packages/cvs/caspar/solaris/pkg/$f; done

joostvb@pong:~/lo.../caspar-20050424/solaris% sh ./bootstrap

joostvb@pong:~/lo...c/caspar/caspar-20050424% make -f solaris/Makefile source

joostvb@pong:~/local/src/caspar% gunzip -dc caspar-20050424_1.diff.gz| less

joostvb@pong:~/lo...c/caspar/caspar-20050424% make -f solaris/Makefile