Resolving dependencies... cabal: Could not resolve dependencies: next goal: github (user goal) rejecting: github-0.13.2, 0.13.1, 0.13, 0.12, 0.11.1, 0.11.0, 0.10.0, 0.9, 0.8, 0.7.4, 0.7.3, 0.7.2, 0.7.1, 0.7.0, 0.6.0, 0.5.0, 0.4.1, 0.4.0, 0.3.0, 0.2.1, 0.2.0, 0.1.2, 0.1.1 (global constraint requires ==0.1) trying: github-0.1 trying: vector-0.10.12.3 (dependency of github-0.1) trying: primitive-0.6 (dependency of vector-0.10.12.3) trying: transformers-0.3.0.0/installed-16a... (dependency of primitive-0.6) trying: uri-0.1.6.3 (dependency of github-0.1) trying: utf8-string-1 (dependency of uri-0.1.6.3) next goal: http-enumerator (dependency of github-0.1) rejecting: http-enumerator-0.7.3.3, 0.7.3.2 (conflict: utf8-string==1, http-enumerator => utf8-string>=0.3.4 && <0.4) rejecting: http-enumerator-0.7.3.1, 0.7.3, 0.7.2.5, 0.7.2.4, 0.7.2.3, 0.7.2.2, 0.7.2.1, 0.7.2, 0.7.1.8, 0.7.1.7, 0.7.1.6, 0.7.1.5, 0.7.1.4, 0.7.1.3, 0.7.1.2, 0.7.1.1, 0.7.1, 0.7.0, 0.6.7, 0.6.6, 0.6.5.6, 0.6.5.5, 0.6.5.4, 0.6.5.3, 0.6.5.2, 0.6.5.1, 0.6.5, 0.6.4.3, 0.6.4.2, 0.6.4.1, 0.6.4, 0.6.3, 0.6.2.1, 0.6.2, 0.6.0.2, 0.6.0.1, 0.6.0, 0.5.1, 0.5.0, 0.4.1, 0.4.0.1, 0.4.0, 0.3.1, 0.3.0, 0.2.1.5, 0.2.1.4, 0.2.1.3, 0.2.1.2, 0.2.1.1, 0.2.1, 0.2.0.4, 0.2.0.3, 0.2.0.2, 0.2.0.1, 0.2.0, 0.1.1, 0.1.0, 0.0.1, 0.0.0 (conflict: transformers==0.3.0.0/installed-16a..., http-enumerator => transformers>=0.2 && <0.3) Backjump limit reached (change with --max-backjumps).