In general to install gr-gsm installation of folowing dependencies is required:

• GNU Radio with header files
• development tools: git, cmake, autoconf, libtool, pkg-config, g++, gcc, make, doxygen,
• gr-osmosdr
• libosmocore with header files

After installing them download the gr-gsm's source and build it with following commands:

git clone https://github.com/ptrkrysik/gr-gsm
cd gr-gsm
mkdir build
cd build
cmake ..
make

and as root:

make install
ldconfig

To speedup compilation instead of "make" you can use parallel build

make -j $nproc

where "$nproc" is number of CPU cores.