Attempted build 1.2.2, got Ambiguous Occurance in Main.hs

[kdd21]

Attempted to build under Ubuntu 20.10 on RPi. Haskell-platform installed via standard apt-get, tried to run "cabal install PortFusion" and it attempted, but produced the below to the log. I know almost nothing about Haskell, but it looks like it made a reasonable try but encountered some conflict with a library or other built-in?:

Configuring PortFusion-1.2.2...
Preprocessing executable 'PortFusion' for PortFusion-1.2.2..
Building executable 'PortFusion' for PortFusion-1.2.2..
[1 of 1] Compiling Main ( src/Main.hs, dist/build/PortFusion/PortFusion-tmp/Main.o )

src/Main.hs:121:84: error:
Ambiguous occurrence ‘<>’
It could refer to
either ‘Prelude.<>’,
imported from ‘Prelude’ at src/Main.hs:16:1-100
(and originally defined in ‘GHC.Base’)
or ‘Main.<>’, defined at src/Main.hs:55:71
|
121 | (<:) :: Show a => Socket -> a -> IO (); s <: a = s sendAll ((B.pack . show $! a) <> "\r\n")
| ^^

src/Main.hs:196:21: error:
Ambiguous occurrence ‘<>’
It could refer to
either ‘Prelude.<>’,
imported from ‘Prelude’ at src/Main.hs:16:1-100
(and originally defined in ‘GHC.Base’)
or ‘Main.<>’, defined at src/Main.hs:55:71
|
196 | build = OS <> " - " <> ARCH <> " [" <> TIMESTAMP <> "]"
| ^^

src/Main.hs:196:30: error:
Ambiguous occurrence ‘<>’
It could refer to
either ‘Prelude.<>’,
imported from ‘Prelude’ at src/Main.hs:16:1-100
(and originally defined in ‘GHC.Base’)
or ‘Main.<>’, defined at src/Main.hs:55:71
|
196 | build = OS <> " - " <> ARCH <> " [" <> TIMESTAMP <> "]"
| ^^

src/Main.hs:196:39: error:
Ambiguous occurrence ‘<>’
It could refer to
either ‘Prelude.<>’,
imported from ‘Prelude’ at src/Main.hs:16:1-100
(and originally defined in ‘GHC.Base’)
or ‘Main.<>’, defined at src/Main.hs:55:71
|
196 | build = OS <> " - " <> ARCH <> " [" <> TIMESTAMP <> "]"
| ^^

src/Main.hs:196:48: error:
Ambiguous occurrence ‘<>’
It could refer to
either ‘Prelude.<>’,
imported from ‘Prelude’ at src/Main.hs:16:1-100
(and originally defined in ‘GHC.Base’)
or ‘Main.<>’, defined at src/Main.hs:55:71
|
196 | build = OS <> " - " <> ARCH <> " [" <> TIMESTAMP <> "]"
| ^^

src/Main.hs:196:78: error:
Ambiguous occurrence ‘<>’
It could refer to
either ‘Prelude.<>’,
imported from ‘Prelude’ at src/Main.hs:16:1-100
(and originally defined in ‘GHC.Base’)
or ‘Main.<>’, defined at src/Main.hs:55:71
|
196 | build = OS <> " - " <> ARCH <> " [" <> TIMESTAMP <> "]"
| ^^
cabal: Failed to build PortFusion-1.2.2. See the build log above for details.