elif.cabal:19:3: invalid subsection "else"
elif.cabal:17:3: invalid subsection "elif". You should set cabal-version: 2.2 or larger to use elif-conditionals.
cabal-version: >=1.10
name: elif
version: 0
synopsis: The elif demo
build-type: Simple

source-repository head
    type: git
    location: https://github.com/hvr/-.git

library
    exposed-modules:
        ElseIf
    default-language: Haskell2010
    
    if os(linux)
        build-depends:
            unix -any