disable doctests conditionally

gyehoek.cabal

@@ -13,6 +13,11 @@ build-type:    Simple
 -- extra-doc-files:    CHANGELOG.md
 -- extra-source-files:
 
+flag doctest
+     description: enable the doctest suite
+     default: True
+     manual: True
+
 common ghcstuffs-dev
   ghc-options:
     -Wno-unused-matches -Wno-missing-signatures -Wno-typed-holes
@@ -156,11 +161,14 @@ test-suite test
   default-language:   GHC2024
 
 -- https://github.com/martijnbastiaan/doctest-parallel/pull/66
--- test-suite doctest
---   import:         ghcstuffs, ghcstuffs-dev
---   type:           exitcode-stdio-1.0
---   hs-source-dirs: test
---   main-is:        doctest.hs
---   build-depends:
---     , base
---     , doctest-parallel  >=0.1
+test-suite doctest
+  import:         ghcstuffs, ghcstuffs-dev
+  type:           exitcode-stdio-1.0
+  hs-source-dirs: test
+  build-depends: base
+  default-extensions: CPP
+  main-is:        doctest.hs
+  if flag(doctest)
+    build-depends: doctest-parallel  >=0.1
+  else
+    cpp-options: "-DGYEHOEK_NO_DOCTEST"