Install ffmpeg-light with cabal - c

Question

I want to install the ffmpeg-light library from hackage via cabal on Windows 10 (64 bit). So I downloaded ffmpeg and extracted it to C:\FFmpeg.
At first pkg-config was complaining that it could not find various packages. I solved this problem with .pc files.
When I tried to use the command: cabal install ffmpeg-light cabal complained about missing C-libraries, being exactly those for which I created the .pc files.
Then I tried the command: cabal install ffmpeg-light --extra-lib-dirs=C:\FFmpeg\lib. Now I have a different error message, which says:
Enums.hsc:7:32: fatal error: libavcodec/avcodec.h: No such file or directory
Edit:
Then I tried the following command:
cabal install ffmpeg-light --extra-lib-dirs=C:\FFmpeg\lib \
--extra-include-dirs=C:\FFmpeg\include
Now first the compiler gives some warnings about deprecated functions in ffmpeg and redundant imports in ffmpeg-light, but compiles 11 of 11. But the build is still not successfull.
In-place registering ffmpeg-light-0.11.1...
setup-Simple-Cabal-1.22.5.0-x86_64-windows-ghc-7.10.3.exe:
'C:\Haskell\bin\ghc-pkg.exe' exited with an error:
ffmpeg-light-0.11.1: Warning: haddock-interfaces:
C:\Users\HOLEYC~1\AppData\Local\Temp\cabal-tmp-2824\ffmpeg-light-0.11.1\dist\doc\html\ffmpeg-light\ffmpeg-light.haddock
doesn't exist or isn't a file
ffmpeg-light-0.11.1: Warning: haddock-html:
C:\Users\HOLEYC~1\AppData\Local\Temp\cabal-tmp-2824\ffmpeg-light-0.11.1\dist\doc\html\ffmpeg-light
doesn't exist or isn't a directory
ffmpeg-light-0.11.1: library-dirs: C:FFmpeglib is a relative path which makes
no sense (as there is nothing for it to be relative to). You can make paths
relative to the package database itself by using ${pkgroot}. (use --force to
override)
ffmpeg-light-0.11.1: include-dirs: C:FFmpeginclude is a relative path which
makes no sense (as there is nothing for it to be relative to). You can make
paths relative to the package database itself by using ${pkgroot}. (use
--force to override)
cabal: Error: some packages failed to install:
ffmpeg-light-0.11.1 failed during the building phase. The exception was:
ExitFailure 1
Some additional information:
cabal version: cabal-install version 1.22.6.0
using version 1.22.5.0 of the Cabal library
gcc version of my installed Haskell platform: 5.2.0
Example .pc file I used for pkg-config:
Name: libavcodec
Description: Library for ffmpeg
Version: 57
Cflags: -IC:\FFmpeg\include
Libs: -LC:\FFmpeg\lib -llibavcodec

Answer 1

OK. I figured it out. The --ghc-pkg-options="--force" option was needed.
cabal install ffmpeg-light --extra-lib-dirs=C:\FFmpeg\lib --extra-include-dirs=C:\FFmpeg\include --ghc-pkg-options="--force"