+++ Gwern Branwen [Nov 21 09 11:38 ]: > On Sat, Nov 21, 2009 at 11:14 AM, Vladimir Ivanov > <[email protected]> wrote: > > I decided to give orchid a try, but failed to install the latest > > version (0.0.8) using cabal. > > > > The reason is that one of the dependencies (filestore) depends on > > parsec-2.0.* and orchid requires parsec3. I installed filestore-0.2 > > separately, but nothing changed. > > > > $ cabal install orchid > > Resolving dependencies... > > cabal: cannot configure filestore-0.2. It requires parsec ==2.* > > For the dependency on parsec ==2.* there are these packages: parsec-2.0, > > parsec-2.1.0.0 and parsec-2.1.0.1. However none of them are available. > > parsec-2.0 was excluded because orchid-0.0.8 requires parsec ==3.0.* > > parsec-2.1.0.0 was excluded because orchid-0.0.8 requires parsec ==3.0.* > > parsec-2.1.0.1 was excluded because orchid-0.0.8 requires parsec ==3.0.* > > > > $ ghc-pkg list filestore > > /usr/lib64/ghc-6.10.1/./package.conf: > > ~/.ghc/x86_64-linux-6.10.1/package.conf: > > filestore-0.2, filestore-0.3.2, filestore-0.3.3 > > > > $ ghc-pkg list parsec > > /usr/lib64/ghc-6.10.1/./package.conf: > > parsec-2.1.0.1, parsec-3.0.0 > > > > $ cabal --version > > cabal-install version 0.6.2 > > using version 1.6.0.2 of the Cabal library > > > > Have you seen this before? > > I hope I overlooked something trivial... =) > > > > -- vi > > Apparently you can build filestore with parsec-3 if you want. > Data/FileStore/Git.hs doesn't seem to use any of the functionality > that changed between 2 & 3. I swapped the dep: > > hunk ./filestore.cabal 35 > - parsec >= 2 && < 3, process, time, > datetime, regex-posix, xml, split, Diff > + parsec >= 3, process, time, datetime, > regex-posix, xml, split, Diff > > Configured, noticing what parsec was being used: > > Dependency parsec >=3: using parsec-3.0.0 > > Built & installed successfully.
This is a bit of a problem. gitit requires parsec >= 2 && < 3, so gitit needs filestore to depend on parsec-2. The reason why is that pandoc depends on parsec-2, and the reason pandoc depends on parsec-2 is that parsec-2 is significantly faster than parsec-3. (I've verified this with several benchmarks, and so have others.) John _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
