On OSX 10.6.6 I'm trying to install Yesod through Cabal but it fails because its unable to build cryptocipher. Has anyone seen this or know an answer? Thanks, Tristan cabal-install version 0.8.2 using version 1.8.0.6 of the Cabal library Resolving dependencies... Configuring cryptocipher-0.2.7... Preprocessing library cryptocipher-0.2.7... Preprocessing executables for cryptocipher-0.2.7... Building cryptocipher-0.2.7... [1 of 8] Compiling Number.Serialize ( Number/Serialize.hs, dist/build/Number/Serialize.o ) [2 of 8] Compiling Number.Generate ( Number/Generate.hs, dist/build/Number/Generate.o ) [3 of 8] Compiling Number.ModArithmetic ( Number/ModArithmetic.hs, dist/build/Number/ModArithmetic.o ) [4 of 8] Compiling Crypto.Cipher.DSA ( Crypto/Cipher/DSA.hs, dist/build/Crypto/Cipher/DSA.o ) [5 of 8] Compiling Crypto.Cipher.RSA ( Crypto/Cipher/RSA.hs, dist/build/Crypto/Cipher/RSA.o ) [6 of 8] Compiling Crypto.Cipher.Camellia ( Crypto/Cipher/Camellia.hs, dist/build/Crypto/Cipher/Camellia.o ) [7 of 8] Compiling Crypto.Cipher.AES ( Crypto/Cipher/AES.hs, dist/build/Crypto/Cipher/AES.o ) Crypto/Cipher/AES.hs:228:30: Not in scope: `V.concat' Crypto/Cipher/AES.hs:229:30: Not in scope: `V.concat' Crypto/Cipher/AES.hs:230:30: Not in scope: `V.concat' Configuring language-javascript-0.4.3... cabal: happy is required but it could not be found. cabal: Error: some packages failed to install: authenticate-0.8.2.2 depends on cryptocipher-0.2.7 which failed to install. cryptocipher-0.2.7 failed during the building phase. The exception was: ExitFailure 1 hjsmin-0.0.13 depends on language-javascript-0.4.3 which failed to install. http-enumerator-0.3.1 depends on cryptocipher-0.2.7 which failed to install. language-javascript-0.4.3 failed during the configure step. The exception was: ExitFailure 1 tls-0.3.3 depends on cryptocipher-0.2.7 which failed to install. yesod-0.7.3 depends on language-javascript-0.4.3 which failed to install. yesod-auth-0.3.2 depends on cryptocipher-0.2.7 which failed to install.