I downloaded the source for happy 1.15, and when I run make, this pops up: /usr/bin/ghc -H16m -O -cpp -fglasgow-exts -O -c LALR.lhs -o LALR.o -ohi LALR.hi LALR.lhs:626:34: Not in scope: `bounds' make[3]: *** [LALR.o] Error 1 make[2]: *** [all] Error 2 make[1]: *** [all] Error 1 make[1]: Leaving directory `/home/rob/downloads/happy-1.15/happy' make: *** [/home/rob/downloads/happy-1.15/happy/src/happy-inplace] Error 2 After erasing hiding (bounds) in these lines: import Data.Array hiding (bounds) import Array hiding (bounds) it does some more work, then this error pops up: /usr/bin/ghc -H16m -O -cpp -fglasgow-exts -O -c ProduceCode.lhs -o ProduceCode.o -ohi ProduceCode.hi ProduceCode.lhs:31:20: Not in scope: `Data.Array.MArray.indices' make[3]: *** [ProduceCode.o] Error 1 make[2]: *** [all] Error 2 make[1]: *** [all] Error 1 make[1]: Leaving directory `/home/rob/downloads/happy-1.15/happy' make: *** [/home/rob/downloads/happy-1.15/happy/src/happy-inplace] Error 2 Is my configuration messed up or something? Thanks, Rob Hoelz