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nobody noticed, but the variable is still called "MODULES" with an S

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.Dd $Mdocdate: July 25 2021 $
.Dt CABAL-MODULE 5
.Os
.Sh NAME
.Nm cabal-module
.Nd devel/cabal port module for building Haskell programs
.Sh DESCRIPTION
This manual page documents the behavior of setting
.Li MODULES=devel/cabal
in the
.Xr ports 7
tree.
.Pp
Uses
.Xr cabal 1
to automate packaging Haskell binary projects.
During
.Cm fetch ,
the dependent packages enumerated in
.Ev MODCABAL_MANIFEST
are downloaded into the
.Pa hackage
subdirectory of
.Ev DIST_SUBDIR .
During
.Cm post-extract ,
the dependency sources are unpacked into
.Ev WORKDIR .
Special care is taken to replace .cabal files if they are updated
post-release on hackage.
A custom
.Pa cabal.project.local
file gets created to direct
.Xr cabal 1
to the extracted packages and prevent any network interaction.
In rare cases a custom
.Pa cabal.project
is required.
This module automatically copies such files from port's
.Pa files
into
.Ev WRKSRC .
During
.Cm build ,
.Xr cabal 1
is invoked to build the executables listed in
.Ev MODCABAL_EXECUTABLES .
.Pp
.Pa lang/ghc
and
.Pa devel/cabal-install
are added to
.Ev BUILD_DEPENDS .
This module uses
.Ev MASTER_SITES9
to download the sources from hackage.
.Pp
This module parameters:
.Bl -tag -width MODCABAL_EXECUTABLES
.It MODCABAL_STEM
Name of the package on hackage (required).
.It MODCABAL_VERSION
Version of the package (required).
.It MODCABAL_MANIFEST
Hackage dependencies required by this package, see below.
.It MODCABAL_DATA_DIR
data-dir from .cabal file (if executable needs this)
.It MODCABAL_REVISION
Numeric revision of .cabal file on hackage if one is
needed on top of .cabal file contained in the .tar.gz file.
.It MODCABAL_BUILD_ARGS
passed to cabal v2-build
.It MODCABAL_FLAGS
custom feature
.Fl -flags
for
.Xr cabal 1 .
.It MODCABAL_EXECUTABLES
Executable target in .cabal file, defaults to hackage package name in
.Ev MODCABAL_STEM .
.El
.Pp
This module adds currently adds no
.Xr make 1
targets.
.Sh DEPENDENCY MANIFEST
Hackage dependencies are listed in
.Ev MODCABAL_MANIFEST
as space separate triples of
.Em package
.Em version
.Em revision .
They correspond to the main package values of
.Ev MODCABAL_STEM
.Ev MODCABAL_VERSION
.Ev MODCABAL_REVISION .
.Pp
The contents of
.Ev MODCABAL_MANIFEST
is normally generated by
.Pa devel/cabal-bundler
which creates a working build plan from hackage dependency information.
.Sh EXAMPLES
To create a new Haskell binary port one would install cabal-bundler
port, look up the chosen package version number on hackage.
E.g.
.Pp
$
.Cm cabal-bundler
.Fl -openbsd
.Ar cpphs-1.20
.Sh SEE ALSO
.Xr cabal 1 ,
.Xr port-modules 5