* Set the version number of generated Debian packages. Note that dpkg

apparently doesn't allows underscores in version strings, so we
  replace them by dashes.  This is the exact opposite of RPM, which
  doesn't allow dashes.

svn path=/nixpkgs/trunk/; revision=34220

pkgs/build-support/release/debian-build.nix

@@ -65,6 +65,7 @@ vmTools.runInLinuxImage (stdenv.mkDerivation (
         --fstrans=${if fsTranslation then "yes" else "no"} \
         --requires="${concatStringsSep "," debRequires}" \
         --provides="${concatStringsSep "," debProvides}" \
+        ${optionalString (src ? version) "--pkgversion=$(echo ${src.version} | tr _ -)"} \
         make install
 
       mkdir -p $out/debs