Hi, In trying to install Tidal, following something that worked for someone else who was getting an error similar to one I got, I ran ghc-clang-wrapper https://gist.github.com/mzero/7245290#file-ghc-clang-wrapper. I believe it was after that that cabal install stopped working, and I lost a lot of libraries that used to exist, such as Sound.MIDI: GHCi, version 7.8.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> import Sound.MIDI <no location info>: Could not find module ‘Sound.MIDI’ It is not a module in the current program, or in any known package. Prelude> When I try to reinstall a library that used to exist -- e.g. "hosc", below -- via cabal install, I now get a giant slew of failures. Any ideas? Many thanks, Jeff sh-3.2# cabal install hosc Resolving dependencies... In order, the following will be installed: binary-0.7.2.2 (new version) data-binary-ieee754-0.4.4 (reinstall) changes: base-4.7.0.1 added, binary-0.7.2.2 added network-2.6.0.2 (new package) text-1.2.0.0 (new package) blaze-builder-0.3.3.4 (reinstall) changes: base-4.7.0.1 added, bytestring-0.10.4.0 added, text-1.2.0.0 added hosc-0.15 (new version) Warning: Note that reinstalls are always dangerous. Continuing anyway... Downloading binary-0.7.2.2... Configuring network-2.6.0.2... Configuring text-1.2.0.0... Failed to install network-2.6.0.2 Build log ( /var/root/.cabal/logs/network-2.6.0.2.log ): Failed to install text-1.2.0.0 Build log ( /var/root/.cabal/logs/text-1.2.0.0.log ): Configuring binary-0.7.2.2... Failed to install binary-0.7.2.2 Build log ( /var/root/.cabal/logs/binary-0.7.2.2.log ): cabal: Error: some packages failed to install: binary-0.7.2.2 failed during the configure step. The exception was: user error (<command line>: cannot satisfy -package-id Cabal-1.20.0.2-b862897337f86101d0e1a35135984eff: Cabal-1.20.0.2-b862897337f86101d0e1a35135984eff is unusable due to missing or recursive dependencies: base-4.7.0.1-df210ede1eb79477fef5662549c32927 bytestring-0.10.4.0-4aa78c8ca7b6b65993eefc131f7d94fa containers-0.5.5.1-0d8db9193d3e3371e0142bcc8a4a0721 deepseq-1.3.0.2-8f63133c1b77f3b3190f04893cf340e4 directory-1.2.1.0-af5afa2b9b551d3fec1a32d6bfd8bd72 process-1.2.0.0-3a472e9c66165e506513ea8f145681a0 time-1.4.2-d6766dce59812a4b19375d9595549a8b unix-2.7.0.1-8adde3f1f2079286da56b30898c2d703 (use -v for more information) ) blaze-builder-0.3.3.4 depends on text-1.2.0.0 which failed to install. data-binary-ieee754-0.4.4 depends on binary-0.7.2.2 which failed to install. hosc-0.15 depends on binary-0.7.2.2 which failed to install. network-2.6.0.2 failed during the configure step. The exception was: user error (<command line>: cannot satisfy -package-id Cabal-1.20.0.2-b862897337f86101d0e1a35135984eff: Cabal-1.20.0.2-b862897337f86101d0e1a35135984eff is unusable due to missing or recursive dependencies: base-4.7.0.1-df210ede1eb79477fef5662549c32927 bytestring-0.10.4.0-4aa78c8ca7b6b65993eefc131f7d94fa containers-0.5.5.1-0d8db9193d3e3371e0142bcc8a4a0721 deepseq-1.3.0.2-8f63133c1b77f3b3190f04893cf340e4 directory-1.2.1.0-af5afa2b9b551d3fec1a32d6bfd8bd72 process-1.2.0.0-3a472e9c66165e506513ea8f145681a0 time-1.4.2-d6766dce59812a4b19375d9595549a8b unix-2.7.0.1-8adde3f1f2079286da56b30898c2d703 (use -v for more information) ) text-1.2.0.0 failed during the configure step. The exception was: user error (<command line>: cannot satisfy -package-id Cabal-1.20.0.2-b862897337f86101d0e1a35135984eff: Cabal-1.20.0.2-b862897337f86101d0e1a35135984eff is unusable due to missing or recursive dependencies: base-4.7.0.1-df210ede1eb79477fef5662549c32927 bytestring-0.10.4.0-4aa78c8ca7b6b65993eefc131f7d94fa containers-0.5.5.1-0d8db9193d3e3371e0142bcc8a4a0721 deepseq-1.3.0.2-8f63133c1b77f3b3190f04893cf340e4 directory-1.2.1.0-af5afa2b9b551d3fec1a32d6bfd8bd72 process-1.2.0.0-3a472e9c66165e506513ea8f145681a0 time-1.4.2-d6766dce59812a4b19375d9595549a8b unix-2.7.0.1-8adde3f1f2079286da56b30898c2d703 (use -v for more information) )