Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: kevin (user goal)
rejecting: kevin-0.11.0, 0.10.0, 0.9.0, 0.8.2, 0.8.1, 0.8, 0.7.2, 0.7.1
(global constraint requires ==0.7)
trying: kevin-0.7
trying: base-4.8.1.0/installed-4f7... (dependency of kevin-0.7)
trying: tls-extra-0.6.6 (dependency of kevin-0.7)
next goal: certificate (dependency of tls-extra-0.6.6)
rejecting: certificate-1.3.9, 1.3.8, 1.3.7, 1.3.6, 1.3.5 (conflict:
base==4.8.1.0/installed-4f7..., certificate => base>=3 && <4.8)
rejecting: certificate-1.3.3, 1.3.2, 1.3.1, 1.3.0, 1.2.9, 1.2.8, 1.2.7, 1.2.6,
1.2.5, 1.2.4, 1.2.3, 1.2.2, 1.2.1, 1.2.0, 1.1.1, 1.1.0, 1.0.1, 1.0.0, 0.9.5,
0.9.4, 0.9.3, 0.9.2, 0.9.1, 0.9.0.1, 0.9.0, 0.8.1, 0.8.0, 0.7.0, 0.6.0, 0.4.0,
0.3.2, 0.3, 0.2.1, 0.2, 0.1 (conflict: tls-extra => certificate>=1.3.5 &&
<1.4.0)
Dependency tree exhaustively searched.