You can then install the resulting Debian package via:
dpkg -i sapgui_7.10rev7_i386.deb
The 'guistart' and 'guilogon' binaries are available as 'sapguistart' and 'sapguilogon' in your path.
Once a new release comes out simply repeat the above steps and all users on your system(s) will enjoy the new version. This has been tested with 7.10r6 and 7.10r7.
The source code is available via:
git clone http://honk.sigxcpu.org/git/sapgui-package.git/
An ITP has already been filed.