[MacPorts] #71933: alex @3.5.1.0+haskell_cabal_use_prebuilt build failure

[MacPorts]

#71933: alex @3.5.1.0+haskell_cabal_use_prebuilt build failure
-----------------------------+--------------------
  Reporter:  Pierre-Alban87  |      Owner:  (none)
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.10.5
Resolution:                  |   Keywords:
      Port:  alex            |
-----------------------------+--------------------

Comment (by SiggyF):

 It might be related to this change, as part of #71821:
 [changeset:3935297d2ea367ecb36aa163c446beb21e4d81fd/macports-ports commit
 3935297]

 If I read it correct ghc is needed to build alex, alex is needed to build
 ghc. So a bootstrapping approach is needed (common in compiling a
 compiler). So you can use the ghc-prebuilt to build alex before you build
 ghc. However ghc-prebuilt is installed as `/opt/local/bin/ghc-prebuilt`
 and it is looking for `/opt/local/bin/ghc`.

 I am not sure how to solve this.

-- 
Ticket URL: <https://trac.macports.org/ticket/71933#comment:6>
MacPorts <https://www.macports.org/>
Ports system for macOS