Why does the Haskell Platform Windows installer suggest a default installation path that contains spaces?!
This breaks builds:

configure:2365: checking build system type
configure:2379: result: x86_64-pc-msys
configure:2399: checking host system type
configure:2412: result: x86_64-pc-msys
configure:2487: checking for gcc
configure:2514: result: C:\PROGRA~1\Haskell Platform\8.6.5\lib\../mingw/bin\gcc.exe
configure:2743: checking for C compiler version
configure:2752: C:\PROGRA~1\Haskell Platform\8.6.5\lib\../mingw/bin\gcc.exe --version >&5
C:\/Users/capnf/Documents/GitHub/gitit/network-3.1.1.1/configure: line 2754: C:\PROGRA~1\Haskell: No such file or directory
configure:2763: $? = 127
configure:2752: C:\PROGRA~1\Haskell Platform\8.6.5\lib\../mingw/bin\gcc.exe -v >&5
C:\/Users/capnf/Documents/GitHub/gitit/network-3.1.1.1/configure: line 2754: C:\PROGRA~1\Haskell: No such file or directory

-db