diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -59,3 +59,25 @@
 * directory
 * source archive (zip, tar.gz, ...) from http or https URL or local file.
 * git, mercurial, svn or bazaar repository
+
+## `hackage2nix`
+
+This repository also contains, in the [`hackage2nix/`](./hackage2nix) directory,
+the tool to update the Haskell packages in
+[nixpkgs](https://github.com/NixOS/nixpkgs). It has its own README there.
+
+## Building
+
+For ease of contribution, we support these methods to build `cabal2nix`:
+
+* `stack build` if you have [_Stack_](http://haskellstack.org/)
+  * The Stack build can use system dependencies from a pinned nixpkgs
+    version for increased reproducibility (see [`stack.yaml`](./stack.yaml)).
+    On NixOS this happens automatically.
+    On non-NixOS, use `stack --nix build` for that.
+* `cabal install` if you have [_cabal-install_](https://www.haskell.org/cabal/)
+  installed
+* TODO: Add a build method that requires only `nix` preinstalled,
+  also pins nixpkgs, and is thus fully reproducible.
+
+When making changes, please ensure that all these methods continue to work.
diff --git a/cabal2nix.cabal b/cabal2nix.cabal
--- a/cabal2nix.cabal
+++ b/cabal2nix.cabal
@@ -1,5 +1,5 @@
 name:               cabal2nix
-version:            2.15.2
+version:            2.15.3
 synopsis:           Convert Cabal files into Nix build instructions.
 description:
   Convert Cabal files into Nix build instructions. Users of Nix can install the latest
@@ -27,7 +27,7 @@
                     gebbert, laMudri, Александр Цамутали
 maintainer:         Peter Simons <simons@cryp.to>
 stability:          stable
-tested-with:        GHC == 8.6.5, GHC == 8.8.3, GHC == 8.10.1
+tested-with:        GHC == 8.8.3, GHC == 8.10.1
 category:           Distribution, Nix
 homepage:           https://github.com/nixos/cabal2nix#readme
 bug-reports:        https://github.com/nixos/cabal2nix/issues
@@ -61,7 +61,9 @@
   other-modules:      Paths_cabal2nix
   hs-source-dirs:     src
   build-depends:      base                 > 4.11
-                    , Cabal                == 3.2.*
+                    -- When changing the Cabal version, ensure that it builds
+                    -- with all installation methods mentioned in the README!
+                    , Cabal                >= 3.0
                     , aeson                > 1
                     , ansi-wl-pprint
                     , bytestring
diff --git a/src/Distribution/Nixpkgs/Haskell/FromCabal.hs b/src/Distribution/Nixpkgs/Haskell/FromCabal.hs
--- a/src/Distribution/Nixpkgs/Haskell/FromCabal.hs
+++ b/src/Distribution/Nixpkgs/Haskell/FromCabal.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RecordWildCards #-}
 
@@ -106,8 +107,13 @@
                              then fromMaybe (error (display package ++ ": X-Cabal-File-Hash field is missing")) (lookup "X-Cabal-File-Hash" customFieldsPD)
                              else "")
     & metaSection .~ ( Nix.nullMeta
+#if MIN_VERSION_Cabal(3,2,0)
                      & Nix.homepage .~ strip isSpace (fromShortText homepage)
                      & Nix.description .~ fromShortText synopsis
+#else
+                     & Nix.homepage .~ strip isSpace homepage
+                     & Nix.description .~ synopsis
+#endif
                      & Nix.license .~ nixLicense
                      & Nix.platforms .~ Nix.allKnownPlatforms
                      & Nix.hydraPlatforms .~ (if isFreeLicense nixLicense then Nix.allKnownPlatforms else Set.empty)