[16:29] aiee(pts/60):~% opam install pprint
The following actions will be performed:
 - upgrade ocurl.0.6.1 to 0.7.0
 - install pprint.20140313
 - upgrade re2.111.03.00 to 111.03.01
 - upgrade merlin.1.5 to 1.6
 - recompile core_extended.111.03.00 [use re2]
1 to install | 1 to reinstall | 3 to upgrade | 0 to downgrade | 0 to remove
Do you want to continue ? [Y/n]