Resolving dependencies...
cabal: Could not resolve dependencies:
trying: GPipe-Examples-0.1 (user goal)
trying: base-4.8.1.0/installed-4f7... (dependency of GPipe-Examples-0.1)
trying: GPipe-2.1.3 (dependency of GPipe-Examples-0.1)
trying: gl-0.7.7 (dependency of GPipe-2.1.3)
trying: directory-1.2.2.0/installed-258... (dependency of gl-0.7.7)
next goal: haskell98 (dependency of GPipe-Examples-0.1)
rejecting: haskell98-2.0.0.3 (conflict: base==4.8.1.0/installed-4f7...,
haskell98 => base>=4.7 && <4.8)
rejecting: haskell98-2.0.0.2 (conflict: base==4.8.1.0/installed-4f7...,
haskell98 => base==4.6.*)
rejecting: haskell98-2.0.0.1, 2.0.0.0 (conflict:
directory==1.2.2.0/installed-258..., haskell98 => directory>=1.1 && <1.2)
rejecting: haskell98-1.1.0.1, 1.1.0.0, 1.0.1.1 (conflict:
base==4.8.1.0/installed-4f7..., haskell98 => base>=3 && <4.6)
rejecting: haskell98-1.0.1.0 (conflict: base==4.8.1.0/installed-4f7...,
haskell98 => base<4.6)
rejecting: haskell98-1.0 (conflict: base==4.8.1.0/installed-4f7..., haskell98
=> base<4.3)
Backjump limit reached (change with --max-backjumps).