[wahern]

All true. Debian and Debian-derived distributions invariably manage their Debian build rules separately from upstream. In that sense there's little difference between RPM and Debian.

However, if as a developer you want to include packaging support inside the project (for your own or your users' convenience), this is infinitely easier to accomplish with Debian than RPM packages. Various aspects of RPM--e.g. spec file template semantics, source and build directory locations--not only assume that packaging is done separately, but make violating those assumptions costly. Whereas Debian package build tools rarely make such assumptions.

If I want to add "deb" and "rpm" targets to my Makefile, the deb target is a one-liner that directly invokes a dpkg tool using standard options. Whereas the rpm target may require generating a specfile (because some specfile variables aren't trivial to dynamically evaluate inline, if at all) and source tarball, or to go through additional contrivances to avoid either of those two things.

[Conan_Kudo]

`rpmbuild` has had a `--build-in-place` feature for a number of years (since rpm 4.13.0). With that, you don't need a source, or a tarball, and the actions of %prep, %build, and %install are done from the current working directory.

This is similar to what have been able to do to make debs with dpkg-deb.