H:\Workings\haskell\nbody>cabal install ftgl --extra-include-dirs=H:\Workings\haskell\ftgl-2.1.3-vc11-64\include --extra-lib-dirs=H:\Workings\haskell\ftgl-2.1.3-vc11-64\lib --reinstall --force-reinstalls
Resolving dependencies...
Notice: installing into a sandbox located at
H:\Workings\haskell\nbody\.cabal-sandbox
Configuring FTGL-2.1...
Failed to install FTGL-2.1
Build log ( H:\Workings\haskell\nbody\.cabal-sandbox\logs\FTGL-2.1.log ):
Configuring FTGL-2.1...
setup-Simple-Cabal-1.22.4.0-x86_64-windows-ghc-7.10.2.exe: Missing dependency
on a foreign library:
* Missing C library: ftgl
This problem can usually be solved by installing the system package that
provides this library (you may need the "-dev" version). If the library is
already installed but in a non-standard location then you can use the flags
--extra-include-dirs= and --extra-lib-dirs= to specify where it is.
cabal: Error: some packages failed to install:
FTGL-2.1 failed during the configure step. The exception was:
ExitFailure 1