Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: grid-proto-0.2.0.1 (user goal)
[__1] next goal: sdl2-ttf (dependency of grid-proto)
[__1] rejecting: sdl2-ttf-2.1.2, sdl2-ttf-2.1.1, sdl2-ttf-2.1.0 (conflict:
pkg-config package SDL2_ttf==2.0.12 || >2.0.12, not found in the pkg-config
database)
[__1] rejecting: sdl2-ttf-2.0.2 (conflict: grid-proto => sdl2-ttf>=2.1.0)
[__1] skipping: sdl2-ttf-2.0.1, sdl2-ttf-2.0.0, sdl2-ttf-1.0.0,
sdl2-ttf-0.2.2, sdl2-ttf-0.2.1, sdl2-ttf-0.2.0 (has the same characteristics
that caused the previous version to fail: excluded by constraint '>=2.1.0'
from 'grid-proto')
[__1] fail (backjumping, conflict set: grid-proto, sdl2-ttf)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: sdl2-ttf, grid-proto