>> sh autogen.sh
>> ./configure
>> make

or

>> sh autogen.sh
>> ./configure PKG_CONFIG_PATH=/Path/to/pkgconfig
>> make

or quicker from src directory

>> c++ -std=c++11 *.cpp -o demo-linux `pkg-config --libs --cflags gtkmm-3.0 gdkmm-3.0` -W -Wall

or

>> g++ -std=c++11 *.cpp -o demo-linux `pkg-config --libs --cflags gtkmm-3.0 gdkmm-3.0` -W -Wall