The Debian-specific package sources are managed in upstream's repository (Debian maintainers are currently also usptream developers). Source Package Format is 1.0. Orig tarball is constructed from upstream's sources top-level dir using 'make orig'. fusionforge_5.1.orig.tar.gz is in sync with upstream's "v5.1" svn tag (rev. 13667) Packages of 5.1 are snapshots of the upstream svn branch "Branch_5_1", i.e. the source package's diffs include "non packaging" changes outside debian/ too, as direct patches to upstream sources. More precisely : - fusionforge-5.1-6 is in sync with upstream SVN contents as of rev. 14319; - fusionforge-5.1-5 is in sync with upstream SVN contents as of rev. 14267; - fusionforge-5.1-4 is in sync with upstream SVN contents as of rev. 14120; - fusionforge-5.1-3 is in sync with upstream SVN contents as of rev. 14089; - fusionforge-5.1-2 is in sync with upstream SVN contents as of rev. 14087; - fusionforge-5.1-1 is in sync with upstream SVN contents as of rev. 14081. In addition to the above, this package uses quilt. For more details, install the quilt package and consult /usr/share/doc/quilt/README.source. The following may provide more details on variations between the upstream main version and Debian's packaging : http://patch-tracker.debian.org/package/fusionforge -- Roland Mas , Tue, 6 Sep 2011 15:42:20 +0200