Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: regex-pcre-builtin (user goal)
rejecting: regex-pcre-builtin-0.94.4.8.8.35, regex-pcre-builtin-0.94.4.8.8.34,
regex-pcre-builtin-0.94.4.7.8.31, regex-pcre-builtin-0.94.4.6.8.34,
regex-pcre-builtin-0.94.4.6.8.32, regex-pcre-builtin-0.94.4.6.8.31,
regex-pcre-builtin-0.94.4.5.8.31, regex-pcre-builtin-0.94.4.4.8.31,
regex-pcre-builtin-0.94.4.3.8.31, regex-pcre-builtin-0.94.4.2.8.31,
regex-pcre-builtin-0.94.4.1.8.31 (constraint from user target requires
==0.94.4.0.8.31)
trying: regex-pcre-builtin-0.94.4.0.8.31
next goal: base (dependency of regex-pcre-builtin-0.94.4.0.8.31)
rejecting: base-4.9.0.0/installed-4.9... (conflict: regex-pcre-builtin =>
base>=4 && <4.6 || >=3 && <4 || <3)
rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
Dependency tree exhaustively searched.