This is just bugfix release to fix some major issues introduced in 1.34.0.
You are downloading Gammu source code. To compile it you need some development environment for your platform and CMake tool to configure the sources. There are also some optional requirements for additional features which are listed in INSTALL file in sources. This file also contains more detailed instructions about compiling Gammu.
This source tarball contains Gammu command line utility, libGammu library and Gammu SMSD.
c37afc07055db87b7d0f51b3ce8b1bce321996b0d4b87888b3ba93710656b308
ba68690d2fc561d206ba5e1a4550047614aa2ffc53e635794ccd24968cbebcf2
c203a982004adc2f816aa71b16983bbff9b444f0404e699ca2566e785aac46f6
cd3e2ee80f197d3c63561dccc1c8fde05d51f8c7e53dba00a5278c5798512a69