[Haskell-cafe] build-depends contraints in a .cabal file

[Antoine Latter]

Can I specify an equality constraint in the build-depends field of a
.cabal file?  This would say that I want one specific version (because
all the rest of my packages are compiled against that version and I'm
getting type-checking errors trying to install the new package).

neither
> build-depends: foobar = 3.0.1

or
> build-depends: foobar-3.0.1

seem to work.

Do I have any choices other than re-compiling everything?

Thanks,
Antoine