let's see how we go...

generator/my-site.cabal

@@ -0,0 +1,19 @@
+cabal-version:       2.4
+
+name:                my-site
+version:             0.1.0.0
+build-type:          Simple
+license:             BSD-3-Clause
+license-file:        LICENSE
+
+executable hakyll-site
+  main-is:           Main.hs
+  hs-source-dirs:    src
+  build-depends:     base == 4.*
+                   , hakyll ^>= 4.13.3.0
+                   , pandoc >= 2.0.5 && < 2.10
+                   , text ^>= 1.2.4
+                   , time >= 1.8 && < 1.10
+  other-modules:     Slug
+  ghc-options:       -Wall -threaded
+  default-language:  Haskell2010