Hello, I recently tried to upgrade some package (eg. yesod) and it seems that, in the process, I screwed up my Haskell packages setup. When I am trying to do a simple:

ghc --make Crete1941

It fails with message: Loader\Communication.hs:14:7: Could not find module `System.Process': Use -v to see a list of the files searched for. which is quite annoying ! Is there a way to reconstruct a sane baseline ? Thanks in advance Arnaud PS: In case it might be helpful, here is the output of ghc-pkg check -v There are problems in package pandoc-1.6: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package zip-archive-0.1.1.6: dependency "binary-0.5.0.2-0da250ded3b79a6e76d15de8e7ffc885" doesn't exist dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package url-2.1.2: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package filestore-0.3.4.3: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package happstack-server-0.5.0.2: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package happstack-data-0.5.0.2: dependency "binary-0.5.0.2-0da250ded3b79a6e76d15de8e7ffc885" doesn't exist There are problems in package feed-0.3.7: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package SHA-1.4.1.3: dependency "binary-0.5.0.2-0da250ded3b79a6e76d15de8e7ffc885" doesn't exist There are problems in package hashed-storage-0.5.3: dependency "binary-0.5.0.2-0da250ded3b79a6e76d15de8e7ffc885" doesn't exist There are problems in package yesod-0.6.0.2: dependency "cereal-0.3.0.0-835aef1b61feb29c879c2cdae5c16608" doesn't exist dependency "clientsession-0.4.0.3-83420d6960f048ed87e049bcfa4d3d35" doesn't exist dependency "neither-0.1.0-50e3e802c117062181b91d4cbd45270b" doesn't exist dependency "wai-0.2.2-11adeb24d79e447264a1c6aa73a257e8" doesn't exist There are problems in package xss-sanitize-0.2.2: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package web-routes-0.23.0: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package wai-extra-0.2.4: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist dependency "wai-0.2.2-11adeb24d79e447264a1c6aa73a257e8" doesn't exist dependency "zlib-bindings-0.0.0-c2a6f489bd57d072e884afc1d6466b99" doesn't exist There are problems in package snap-server-0.2.11: dependency "cereal-0.3.0.0-835aef1b61feb29c879c2cdae5c16608" doesn't exist dependency "monads-fd-0.1.0.2-8e71857db7c17ae96ca5bff72f20d9fa" doesn't exist There are problems in package snap-core-0.2.11: dependency "cereal-0.3.0.0-835aef1b61feb29c879c2cdae5c16608" doesn't exist dependency "monads-fd-0.1.0.2-8e71857db7c17ae96ca5bff72f20d9fa" doesn't exist There are problems in package pureMD5-2.1.0.2: dependency "binary-0.5.0.2-0da250ded3b79a6e76d15de8e7ffc885" doesn't exist dependency "cereal-0.3.0.0-835aef1b61feb29c879c2cdae5c16608" doesn't exist There are problems in package persistent-0.3.0.1: dependency "neither-0.1.0-50e3e802c117062181b91d4cbd45270b" doesn't exist There are problems in package hsx-0.7.0: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package HStringTemplate-0.6.5: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package HSlim-0.1: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package hint-0.3.3.0: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package haskeline-0.6.3.1: dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package happstack-state-0.5.0.2: dependency "binary-0.5.0.2-0da250ded3b79a6e76d15de8e7ffc885" doesn't exist dependency "happstack-data-0.5.0.2-80c87686add000961445ac7ad8f41385" doesn't exist dependency "happstack-util-0.5.0.2-781b128492ee5ce69eb3c01f6e6a02bb" doesn't exist There are problems in package happstack-ixset-0.5.0.2: dependency "happstack-data-0.5.0.2-80c87686add000961445ac7ad8f41385" doesn't exist dependency "happstack-util-0.5.0.2-781b128492ee5ce69eb3c01f6e6a02bb" doesn't exist There are problems in package happstack-0.5.0.2: dependency "happstack-data-0.5.0.2-80c87686add000961445ac7ad8f41385" doesn't exist dependency "happstack-server-0.5.0.2-9d48ec66664b8dd67d495020314c5d2b" doesn't exist dependency "happstack-util-0.5.0.2-781b128492ee5ce69eb3c01f6e6a02bb" doesn't exist dependency "utf8-string-0.3.6-02c7018b15768d3d72b99557d0f847ff" doesn't exist There are problems in package crypto-api-0.1.2.4: dependency "cereal-0.3.0.0-835aef1b61feb29c879c2cdae5c16608" doesn't exist There are problems in package bytestring-show-0.3.3: dependency "binary-0.5.0.2-0da250ded3b79a6e76d15de8e7ffc885" doesn't exist There are problems in package attoparsec-iteratee-0.1.1: dependency "monads-fd-0.1.0.2-8e71857db7c17ae96ca5bff72f20d9fa" doesn't exist There are problems in package regex-compat-0.93.1: dependency "regex-posix-0.94.2-0a3c1e41d8c2d26547372e229b3f776c" doesn't exist There are problems in package haskell-platform-2010.2.0.0: dependency "regex-posix-0.94.2-0a3c1e41d8c2d26547372e229b3f776c" doesn't exist The following packages are broken, either because they have a problem listed above, or because they depend on a broken package. pandoc-1.6 zip-archive-0.1.1.6 url-2.1.2 filestore-0.3.4.3 happstack-server-0.5.0.2 happstack-data-0.5.0.2 feed-0.3.7 SHA-1.4.1.3 hashed-storage-0.5.3 yesod-0.6.0.2 xss-sanitize-0.2.2 web-routes-0.23.0 wai-extra-0.2.4 snap-server-0.2.11 snap-core-0.2.11 pureMD5-2.1.0.2 persistent-0.3.0.1 hsx-0.7.0 HStringTemplate-0.6.5 HSlim-0.1 hint-0.3.3.0 haskeline-0.6.3.1 happstack-state-0.5.0.2 happstack-ixset-0.5.0.2 happstack-0.5.0.2 crypto-api-0.1.2.4 bytestring-show-0.3.3 attoparsec-iteratee-0.1.1 regex-compat-0.93.1 haskell-platform-2010.2.0.0 ConfigFile-1.0.6 MissingH-1.1.0.3 hsp-0.5.2 HJScript-0.5.0