Here's another set of errors:
oomek@ubuntu:~/Documents/attract-master$ make -j 3 CROSS=1 TOOLCHAIN=x86_64-w64-mingw32.static WINDOWS_STATIC=1
Package sfml-system was not found in the pkg-config search path.
Perhaps you should add the directory containing `sfml-system.pc'
to the PKG_CONFIG_PATH environment variable
Package 'sfml-system', required by 'world', not found
Package 'sfml-window', required by 'world', not found
Package 'sfml-graphics', required by 'world', not found
Package 'sfml-network', required by 'world', not found
Package freetype2 was not found in the pkg-config search path.
Perhaps you should add the directory containing `freetype2.pc'
to the PKG_CONFIG_PATH environment variable
Package 'freetype2', required by 'world', not found
Package 'libavformat', required by 'world', not found
Package 'libavcodec', required by 'world', not found
Package 'libavutil', required by 'world', not found
Package 'libswscale', required by 'world', not found
Package 'openal', required by 'world', not found
Anyone? please, help, or end my suffering