I am asking here, because I can't register there, they are asking questions ::)
I followed these instructions from here : http://www.iforce2d.net/b2dtut/setup-linux
wget https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/box2d/Box2D_v2.1.2.zip (https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/box2d/Box2D_v2.1.2.zip)
unzip Box2D_v2.1.2.zip
cd Box2D_v2.1.2/Box2D/Build
cmake ..
make
but I am getting
CMakeFiles/Makefile2:307: recipe for target 'Testbed/CMakeFiles/Testbed.dir/all' failed
make[1]: *** [Testbed/CMakeFiles/Testbed.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
any ubuntu users who installed it can you help me !