Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: dropbox-sdk (user goal)
rejecting: dropbox-sdk-0.3.1 (global constraint requires ==0.3.0)
trying: dropbox-sdk-0.3.0
next goal: certificate (dependency of dropbox-sdk-0.3.0)
rejecting: certificate-1.3.9, 1.3.8, 1.3.7, 1.3.6, 1.3.5, 1.3.3, 1.3.2, 1.3.1,
1.3.0, 1.2.9, 1.2.8, 1.2.7 (conflict: base==4.8.1.0/installed-4f7...,
certificate => base>=3 && <4.8)
trying: certificate-1.2.6
trying: process-1.2.3.0/installed-f02... (dependency of certificate-1.2.6)
next goal: unix (dependency of process-1.2.3.0/installed-f02...)
rejecting: unix-2.7.1.0/installed-643... (conflict: unix =>
bytestring==0.10.6.0/installed-236..., dropbox-sdk => bytestring==0.9.*)
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).