On Mon, Dec 12, 2011 at 6:25 PM, Matthew Farkas-Dyck
<[email protected]> wrote:
> I have written some code that can be compiled with either of two
> libraries, with no modification. How can I tell Cabal?
>
> I tried "||" but it failed to parse.
>
> I could find which package is available in the build script, and then
> call defaultMainNoRead with the appropriate GenericPackageDescription,
> but I'm not sure how to find this system-agnostically.
You just need to use flags. Something like
Flag usethis
Description: Use this instead of that
Default: False
Library
Build-depends: ...everything else...
if flag(usethis)
Build-depends: this == 0.1.*
else
Build-depends: that == 4.0.*
You don't need to care about usethis. If 'that' is not installed but
'this' is, Cabal will automatically turn 'usethis' flag on.
Cheers,
--
Felipe.
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