[ 63%] Linking CXX shared library libnanogui.so
/usr/bin/ld: cannot find -lGL
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/nanogui.dir/build.make:629: libnanogui.so] Error 1
make[1]: *** [CMakeFiles/Makefile2:330: CMakeFiles/nanogui.dir/all] Error 2
make: *** [Makefile:130: all] Error 2