Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: yesod-mangopay (user goal)
rejecting: yesod-mangopay-1.11.5, 1.11.4, 1.11.2, 1.11.1, 1.11, 1.10, 1.9.2,
1.9.1, 1.9, 1.7.1, 1.7.0 (global constraint requires ==1.6)
trying: yesod-mangopay-1.6
next goal: yesod-static (dependency of yesod-mangopay-1.6)
rejecting: yesod-static-1.5.0.3, 1.5.0.2, 1.5.0.1, 1.5.0, 1.4.0.4, 1.4.0.3,
1.4.0.2, 1.4.0.1, 1.4.0 (conflict: yesod-mangopay => yesod-static>=1.2 &&
<1.3)
trying: yesod-static-1.2.4
trying: process-1.2.3.0/installed-f02... (dependency of yesod-static-1.2.4)
next goal: unix (dependency of process-1.2.3.0/installed-f02...)
rejecting: unix-2.7.1.0/installed-643... (conflict: unix =>
time==1.5.0.1/installed-c20..., yesod-mangopay => time>=1.4.0 && <1.5)
rejecting: unix-2.7.1.0, 2.7.0.1, 2.7.0.0, 2.6.0.1, 2.6.0.0, 2.5.1.1, 2.5.1.0,
2.5.0.0, 2.4.2.0, 2.4.1.0, 2.4.0.2, 2.4.0.1, 2.4.0.0, 2.3.2.0, 2.3.1.0,
2.3.0.0, 2.2.0.0, 2.0 (conflict: process => unix==2.7.1.0/installed-643...)
Backjump limit reached (change with --max-backjumps).