I am trying to cabal install yesod on my Windows machine. I have a relatively fresh install of the Haskell Platform. The cabal install failed, reporting that I need the sqlite3 C library in order to install "persistent", a package which Yesod relies upon.
cabal: Missing dependency on a foreign library: * Missing C library: sqlite3
So I went to http://www.sqlite.org/download.html and grabbed both the C source and the precompiled binary. I tried using both, to no avail:
cabal install persistent --extra-lib-dirs=C:\Path\To\C\Source\Files
cabal install persistent --extra-lib-dirs=C:\Path\To\Binary
In both cases, I got the same result: it didn't work. :( What can I do to give cabal the C library it needs? (sqlite3 in this case)
So, facepalm. I didn't need the source, I didn't need the exe. I needed the dll.
Under the "precompiled binaries for Windows" section of the website mentioned in my question, I downloaded and extracted the zip file with sqlite3.def and sqlite.dll. Then I used
cabal install persistent --extra-lib-dirs=C:\Path\To\DllAndDef
The installation appears to have completed successfully. Afterwards, I did a cabal install yesod, which also appears to have completed successfully.
I suppose if I had put the dll somewhere magical, then I wouldn't have had to use the --extra-lib-dirs= option.
来源：https://stackoverflow.com/questions/7382334/cabal-install-needs-c-library-windows