Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: linux-ptrace (user goal)
rejecting: linux-ptrace-0.1.2, 0.1.1 (global constraint requires ==0.1)
trying: linux-ptrace-0.1
trying: process-1.2.3.0/installed-f02... (dependency of linux-ptrace-0.1)
next goal: bytestring (dependency of linux-ptrace-0.1)
rejecting: bytestring-0.10.6.0/installed-236..., 0.10.6.0, 0.10.4.1, 0.10.4.0,
0.10.2.0, 0.10.0.2, 0.10.0.1, 0.10.0.0 (conflict: linux-ptrace =>
bytestring==0.9.*)
trying: bytestring-0.9.2.1
next goal: unix (dependency of linux-ptrace-0.1)
rejecting: unix-2.7.1.0/installed-643... (conflict: bytestring==0.9.2.1, unix
=> bytestring==0.10.6.0/installed-236...)
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...)
Dependency tree exhaustively searched.