If you didn't have them both as executables at the same time but built each separately based on a flag then this should work. On Wed, Nov 11, 2009 at 11:40 AM, Hackage wrote:

#604: a feature to explicitly allow multiple versions of a single dependency ----------------------------+-----------------------------------------------  Reporter:  guest          |        Owner:      Type:  enhancement    |       Status:  new  Priority:  normal         |    Milestone:  Component:  Cabal library  |      Version:  1.6.0.1  Severity:  normal         |     Keywords: Difficulty:  unknown        |   Ghcversion:  6.10.1  Platform:  Linux          | ----------------------------+-----------------------------------------------  I wanted to build two executables for comparing the performance difference  between happstack-server-0.3.4 and happstack-server-0.4. So I wrote below  cabal file but found that cabal cannot build what I want. Here is the  output for "cabal configure":

 {{{  aycan@fgt:~/haskell/tests/happstack-tests$ cabal configure  Resolving dependencies...  Configuring happstack-tests-0.1...  cabal: At least the following dependencies are missing:  happstack-server ==0.4 && ==0.3.4  }}}

 {{{  Name: happstack-tests  Version: 0.1  Author: Aycan iRiCAN  Stability: Experimental  Category: Web  Synopsis: Tests for Happstack Packages  Cabal-version: >= 1.6  Build-Type: Simple

 Flag base4     Description: Choose the even newer, even smaller, split-up base  package.

 Executable hello-0.3.3   Main-Is: Hello.hs   Hs-source-dirs: happstack-server   GHC-options: -threaded -Wall -Wwarn -O2 -fwarn-tabs -fwarn-unused-  imports   Build-depends:      base    , happstack-server == 0.3.4

 Executable hello-0.4   Main-Is: Hello.hs   Hs-source-dirs: happstack-server   GHC-options: -threaded -Wall -Wwarn -O2 -fwarn-tabs -fwarn-unused-  imports   Build-depends:      base    , happstack-server == 0.4  }}}

-- Ticket URL: http://hackage.haskell.org/trac/hackage/ticket/604 Hackage http://haskell.org/cabal/ Hackage: Cabal and related projects _______________________________________________ cabal-devel mailing list cabal-devel@haskell.org http://www.haskell.org/mailman/listinfo/cabal-devel