[Agda] cabal cannot install Agda 2.6.0

[Pierre Lescanne]

I failed also to install Agda 2.6.0 using cabal because a file necessary 
in the installation is missing, namely /alex/. Here is the message that 
I got:

    /setup: The program 'alex' version >=3.1.0 && <3.2.0 || ==3.2.1 ||
     >=3.2.3 is/
    ///required but it could not be found./
    ///cabal: Leaving directory '/tmp/cabal-tmp-15469/Agda-2.6.0.1'/
    ///cabal: Error: some packages failed to install:/
    ///Agda-2.6.0.1 failed during the configure step. The exception was:/
    ///ExitFailure 1/

-- 
Cheers


---------------------------
Pierre Lescanne (Professeur émérite)
LIP / ENS de Lyon
46 allée d'Italie
69364 LYON Cedex 07, France
tél: +33 6 85 70 94 31
http://perso.ens-lyon.fr/pierre.lescanne/
---------------------------

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