are emitted.

<!-- TODO(@sternenseemann):
`checkUnusedPackages opts drv`
: Adds an extra check to `postBuild` which fails the build if any dependency
taken as an input is not used. The `opts` attribute set allows relaxing this
check.
-->

`enableDWARFDebugging drv`
: Compiles the package with additional debug symbols enabled, useful
for debugging with e.g. `gdb`.

`doStrip drv`
: Sets `doStrip` to `true` for `drv`.

`dontStrip drv`
: Sets `doStrip` to `false` for `drv`.

<!-- TODO(@sternenseemann): shellAware -->

##### Trivial Helpers {#haskell-trivial-helpers}

`doJailbreak drv`
: Sets the `jailbreak` argument to `true` for `drv`.

`dontJailbreak drv`
: Sets the `jailbreak` argument to `false` for `drv`.

`doHaddock drv`
: Sets `doHaddock` to `true` for `drv`.

`dontHaddock drv`
: Sets `doHaddock` to `false` for `drv`. Useful if the build of a package is
failing because of e.g. a syntax error in the Haddock documentation.

`doHyperlinkSource drv`
: Sets `hyperlinkSource` to `true` for `drv`.

`dontHyperlinkSource drv`
: Sets `hyperlinkSource` to `false` for `drv`.

`doCheck drv`
: Sets `doCheck` to `true` for `drv`.

`dontCheck drv`
: Sets `doCheck` to `false` for `drv`. Useful if a package has a broken,
flaky or otherwise problematic test suite breaking the build.

`dontCheckIf condition drv`
: Sets `doCheck` to `false` for `drv`, but only if `condition` applies.
Otherwise it's a no-op. Useful to conditionally disable tests for a package
without interfering with previous overrides or default values.

<!-- Purposefully omitting the non-list variants here. They are a bit
ugly, and we may want to deprecate them at some point. -->

`appendConfigureFlags list drv`
: Adds the strings in `list` to the `configureFlags` argument for `drv`.

`enableCabalFlag flag drv`
: Makes sure that the Cabal flag `flag` is enabled in Cabal's configure step.

`disableCabalFlag flag drv`
: Makes sure that the Cabal flag `flag` is disabled in Cabal's configure step.

`appendBuildFlags list drv`
: Adds the strings in `list` to the `buildFlags` argument for `drv`.

<!-- TODO(@sternenseemann): removeConfigureFlag -->

`appendPatches list drv`
: Adds the `list` of derivations or paths to the `patches` argument for `drv`.

<!-- TODO(@sternenseemann): link dep section -->

`addBuildTools list drv`
: Adds the `list` of derivations to the `buildTools` argument for `drv`.

`addExtraLibraries list drv`
: Adds the `list` of derivations to the `extraLibraries` argument for `drv`.

`addBuildDepends list drv`
: Adds the `list` of derivations to the `buildDepends` argument for `drv`.

`addTestToolDepends list drv`
: Adds the `list` of derivations to the `testToolDepends` argument for `drv`.

`addPkgconfigDepends list drv`
: Adds the `list` of derivations to the `pkg-configDepends` argument for `drv`.

`addSetupDepends list drv`
: Adds the `list` of derivations to the `setupHaskellDepends` argument for `drv`.

`doBenchmark drv`
: Set `doBenchmark` to `true` for `drv`. Useful if your development
environment is missing the dependencies necessary for compiling the
benchmark component.

`dontBenchmark drv`
: Set `doBenchmark` to `false` for `drv`.

`setBuildTargets drv list`
: Sets the `buildTarget` argument for `drv` so that the targets specified in `list` are built.

`doCoverage drv`
: Sets the `doCoverage` argument to `true` for `drv`.

`dontCoverage drv`
: Sets the `doCoverage` argument to `false` for `drv`.

`enableExecutableProfiling drv`
: Sets the `enableExecutableProfiling` argument to `true` for `drv`.

`disableExecutableProfiling drv`
: Sets the `enableExecutableProfiling` argument to `false` for `drv`.

`enableLibraryProfiling drv`
: Sets the `enableLibraryProfiling` argument to `true` for `drv`.

`disableLibraryProfiling drv`
: Sets the `enableLibraryProfiling` argument to `false` for `drv`.

`disableParallelBuilding drv`
: Sets the `enableParallelBuilding` argument to `false` for `drv`.

#### Library functions in the Haskell package sets {#haskell-package-set-lib-functions}