yesod-bin manca una dipendenza (sconosciuta)?

Question

Come è possibile installare l'eseguibile yesod?

> cabal install yesod-bin 
Resolving dependencies... 
cabal: Could not resolve dependencies: 
trying: yesod-bin-1.2.0 

quindi non mi dice che la dipendenza reale è mancante.

Tutto andava bene con Yesod. Ho aggiornato il mio sistema operativo Linux a Suse12.3, e in seguito yesod si è lamentato di dozzine di dipendenze non funzionanti. Così ho disinstallato ghc, cancellato .ghc e .cabal nella mia home directory, reinstallato il haskell-platform, fatto cabal update e poi cabal install yesod-platform, che andò tutto bene. Notando il binario yesod mancante, ho trovato il post sul blog riguardo alla versione di Yesod 1.2 e ho provato a installare yesod-bin, che non funziona senza un messaggio di errore utile ora. Anche aumentando il livello di dettaglio non fornisce tutte le informazioni utili per me:

> 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",["dump","--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 

Answer 1

Alcune distribuzioni non includono il pacchetto dighclibreria nel haskell-platform, che a mio parere è sbagliato.

Questo in connessione con il fatto che lo cabal produce un messaggio di errore molto cattivo per un pacchetto sconosciuto.

Con brevemente guardando pacchetti di openSUSE, sembra come se avete bisogno di ghc-ghc: http://software.opensuse.org/package/ghc-ghc