How can I set SDL2_PATH environment variable on linux (ubuntu)?

I had installed sdl2 by using the command ` sudo apt-get install libsdl2-2.0-0 libsdl2-dev`, then it was installed under the folder `/bin/sdl2-config`. When I run `zig build` I still get the error `Build Error: ENV variable 'SDL2_PATH' not found%`.

Also tried doing `export SDL2_PATH=/bin/sdl2-config`, but it didn't help.