Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: simple-sendfile (user goal)
rejecting: simple-sendfile-0.2.21, 0.2.20, 0.2.19, 0.2.18, 0.2.17, 0.2.16,
0.2.15, 0.2.14, 0.2.13, 0.2.12, 0.2.11, 0.2.10 (global constraint requires
==0.2.9)
trying: simple-sendfile-0.2.9
next goal: base (dependency of simple-sendfile-0.2.9)
rejecting: base-4.8.1.0/installed-4f7... (conflict: simple-sendfile => base<0)
rejecting: base-4.8.1.0, 4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0,
4.5.1.0, 4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1,
4.2.0.0, 4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires
installed instance)
Dependency tree exhaustively searched.