I am having some trouble building ghc on ubuntu. I have ghc 8.8.4 installed on the machine. I pulled from the main repository and followed the instructions here: https://gitlab.haskell.org/ghc/ghc/-/wikis/building/hadrian Building with: ./hadrian/build -j it builds for a long time until it finally fails with the message below. I would appreciate some advice on how to fix this. Thank you, Neo =========================== Exit code: 1 Stderr and Stdout: _build/stage1/compiler/build/GHC/Parser/Lexer.hs:3495:3: error: Variable not in scope: int16ToInt# :: Int# -> Int# | 3495 | int16ToInt# | ^^^^^^^^^^^ _build/stage1/compiler/build/GHC/Parser/Lexer.hs:3520:3: error: Variable not in scope: int32ToInt# :: Int# -> Int# | 3520 | int32ToInt# | ^^^^^^^^^^^ =========================== On that line (in Lexer.hs) we see: #if __GLASGOW_HASKELL__ >= 901 int16ToInt# #endif (indexInt16OffAddr# arr off) #endif so we are in the "then" clause and somehow "int16ToInt#" is nowhere to be found. -- Neo