如何安装yesod可执行文件？
> cabal install yesod-bin Resolving dependencies... cabal: Could not resolve dependencies: trying: yesod-bin-1.2.0
所以它没有告诉我缺少的实际依赖.
以前一切都很好.我将我的linux操作系统更新为Suse12.3,然后yesod抱怨了几十个破坏的依赖项.所以我卸载了ghc,在我的主目录中删除了.ghc和.cabal,重新安装了haskell-platform,做了cabal更新,然后cabal安装yesod-platform,这一切都很顺利.注意到缺少yesod二进制文件,我发现了有关Yesod 1.2发布的博客文章,并尝试安装yesod-bin,现在失败但没有有用的错误消息.即使增加详细程度也不会向我提供任何有用的信息：
> ghc --version The GlorIoUs Glasgow Haskell Compilation System,version 7.4.2 > cabal --verbose=3 install yesod-bin searching for ghc in path. found ghc at /usr/bin/ghc ("/usr/bin/ghc",["--numeric-version"]) /usr/bin/ghc is version 7.4.2 looking for tool "ghc-pkg" near compiler in /usr/bin found ghc-pkg in /usr/bin/ghc-pkg ("/usr/bin/ghc-pkg",["--version"]) /usr/bin/ghc-pkg is version 7.4.2 ("/usr/bin/ghc",["--supported-languages"]) ("/usr/bin/ghc",["--info"]) Reading installed packages... ("/usr/bin/ghc-pkg",["dump","--global","-v0"]) ("/usr/bin/ghc-pkg","--user","-v0"]) ("/usr/bin/ghc",["--print-libdir"]) Reading available packages... Choosing modular solver. Resolving dependencies... [__0] trying: yesod-bin-1.2.0 [__1] rejecting: base-3.0.3.2,3.0.3.1 (global constraint requires installed instance) [__1] trying: base-4.5.1.0/installed-6e4... [__2] trying: rts-1.0/installedbuil... [__3] trying: integer-gmp-0.4.0.0/installed-af3... [__4] trying: ghc-prim-0.2.0.0/installed-7d3... [__5] trying: wai-1.4.0/installed-3a1... [__6] trying: vault-0.2.0.4/installed-2b6... [__7] trying: hashable-1.2.0.7/installed-d66... [__8] trying: warp-1.3.8.1/installed-ace... [__9] trying: void-0.6/installed-a34... [_10] trying: semigroups-0.9.1/installed-e88... [_11] trying: nats-0.1/installed-b6a... [_12] trying: unix-2.5.1.1/installed-48f... [_13] trying: simple-sendfile-0.2.11/installed-74a... [_14] trying: case-insensitive-1.0.0.1/installed-709... [_15] trying: deepseq-1.3.0.0/installed-c26... [_16] trying: array-0.4.0.0/installed-0b6... [_17] trying: blaze-builder-conduit-1.0.0/installed-3d2... [_18] trying: transformers-0.3.0.0/installed-8e6... [_19] trying: project-template-0.1.3 [_20] trying: project-template-0.1.3:!test [_21] trying: mtl-2.1.2/installed-02e... [_22] trying: base64-conduit-1.0.0 [_23] trying: base64-conduit-1.0.0:!test [_24] trying: classy-prelude-0.5.4 [_25] trying: classy-prelude-0.5.4:!test [_26] trying: vector-0.10.0.1/installed-345... [_27] trying: primitive-0.5.0.1/installed-15c... [_28] trying: basic-prelude-0.3.5.0 [_29] trying: ReadArgs-1.2.1 [_30] trying: ReadArgs-1.2.1:!test [_31] trying: network-conduit-1.0.0/installed-073... [_32] trying: monad-control-0.3.2.1/installed-325... [_33] trying: transformers-base-0.4.1/installed-8ce... [_34] trying: base-unicode-symbols-0.2.2.4/installed-47d... [_35] trying: http-conduit-1.9.3/installed-ef7... [_36] trying: zlib-conduit-1.0.0/installed-285... [_37] trying: zlib-bindings-0.1.1.3/installed-ef4... [_38] trying: utf8-string-0.3.7/installed-3aa... [_39] trying: tls-extra-0.6.1/installed-a7d... [_40] trying: pem-0.1.2/installed-6f3... [_41] trying: cereal-0.3.5.2/installed-807... [_42] trying: cryptohash-0.9.0/installed-4c8... [_43] trying: tagged-0.6/installed-8e1... [_44] trying: crypto-api-0.12/installed-07e... [_45] trying: entropy-0.2.1/installed-b34... [_46] trying: crypto-random-api-0.2.0/installed-dd2... [_47] trying: crypto-pubkey-0.1.3/installed-e49... [_48] trying: crypto-pubkey-types-0.3.2/installed-0f2... [_49] trying: asn1-types-0.1.3/installed-29c... [_50] trying: crypto-numbers-0.1.3/installed-c6e... [_51] trying: cipher-rc4-0.1.2/installed-854... [_52] trying: cipher-aes-0.1.8/installed-aaa... [_53] trying: tls-1.1.2/installed-106... [_54] trying: socks-0.5.1/installed-1e3... [_55] trying: regex-compat-0.95.1/installed-cc3... [_56] trying: regex-posix-0.95.2/installed-417... [_57] trying: regex-base-0.93.2/installed-920... [_58] trying: random-1.0.1.1/installed-a21... [_59] trying: publicsuffixlist-0.1/installed-7c1... [_60] trying: mime-types-0.1.0.3/installed-f07... [_61] trying: failure-0.2.0.1/installed-579... [_62] trying: data-default-0.5.3/installed-f33... [_63] trying: data-default-instances-old-locale-0.0.1/installed-e48... [_64] trying: old-locale-1.0.0.4/installed-5e4... [_65] trying: data-default-instances-dlist-0.0.1/installed-ec3... [_66] trying: dlist-0.5/installed-0a8... [_67] trying: data-default-instances-containers-0.0.1/installed-a88... [_68] trying: data-default-instances-base-0.0.1/installed-2ea... [_69] trying: data-default-class-0.0.1/installed-404... [_70] trying: cprng-aes-0.3.4/installed-bc2... [_71] trying: cookie-0.4.0.1/installed-9d9... [_72] trying: certificate-1.3.7/installed-d6c... [_73] trying: asn1-data-0.7.1/installed-8ec... [_74] trying: network-2.3.1.0/installed-efa... [_75] trying: http-reverse-proxy-0.1.1.6 [_76] trying: http-reverse-proxy-0.1.1.6:!test [_77] trying: word8-0.0.3/installed-366... [_78] trying: lifted-base-0.2.0.4/installed-1f9... [_79] trying: base64-bytestring-1.0.0.1/installed-ffa... [_80] trying: resourcet-0.4.7.1/installed-45e... [_81] trying: mmorph-1.0.0/installed-19c... [_82] trying: conduit-1.0.5/installed-a38... [_83] trying: file-embed-0.0.4.7/installed-004... [_84] trying: split-0.2.1.1/installed-03e... [_85] trying: fsnotify-0.0.11 [_86] trying: fsnotify-0.0.11:!test [_87] trying: hinotify-0.3.5 [_88] trying: hinotify-0.3.5:+split-base [_89] trying: optparse-applicative-0.5.2.1 [_90] trying: optparse-applicative-0.5.2.1:!test [_91] trying: yaml-0.8.2.4/installed-68e... [_92] trying: aeson-0.6.1.0/installed-9bd... [_93] trying: syb-0.3.7/installed-60a... [_94] trying: unordered-containers-0.2.3.1/installed-55f... [_95] trying: system-fileio-0.3.11/installed-2fc... [_96] trying: system-filepath-0.4.7/installed-977... [_97] trying: tar-0.4.0.1 [_98] trying: old-time-1.1.0.0/installed-703... [_99] trying: zlib-0.5.4.0/installed-f9a... [100] trying: process-1.1.0.1/installed-608... [101] trying: filepath-1.3.0.0/installed-f99... [102] trying: blaze-builder-0.3.1.1/installed-536... [103] trying: http-types-0.8.0/installed-a08... [104] trying: attoparsec-0.10.4.0/installed-c39... [105] trying: containers-0.4.2.1/installed-75f... [106] trying: unix-compat-0.4.1.1/installed-35c... [107] trying: directory-1.1.0.2/installed-c30... [108] trying: template-haskell-2.7.0.0/installed-2bd... [109] trying: pretty-1.1.1.0/installed-91e... [110] trying: time-1.4/installed-d61... [111] trying: bytestring-0.9.2.1/installed-503... [112] trying: shakespeare-css-1.0.5.1/installed-013... [113] trying: shakespeare-js-1.1.4/installed-df8... [114] trying: shakespeare-1.0.5/installed-9c1... [115] trying: shakespeare-text-1.0.0.5 [116] trying: shakespeare-text-1.0.0.5:!test [117] trying: text-0.11.2.3/installed-db6... [118] trying: parsec-3.1.3/installed-771... [119] rejecting: ghc-paths-0.1.0.9 (unknown package: ghc) [__0] fail (backjumping,conflict set: ghc,yesod-bin) cabal: Could not resolve dependencies: trying: yesod-bin-1.2.0
有些发行版不包含haskell-platform中的ghc库包,我认为这是错误的.
这与cabal为未知包装产生非常糟糕的错误消息这一事实有关.
通过简要地查看opensuse包,看起来好像你需要ghc-ghc：http://software.opensuse.org/package/ghc-ghc
