This is a fork of some of the synthesis submodule (combined with inter project dependencies) of CASA 4.4. It is taken from the NRAO svn repository:
https://svn.cv.nrao.edu/svn/casa/branches/release-4_4/code/
$ mkdir build
$ cd build
$ cmake -DCMAKE_INSTALL_PREFIX=/opt/casasynthesis ..
$ make
$ make install