Hi, I am trying to build ghc 6.8.3 from source release, my currently installed version is ghc 6.4.2 (x86 linux binary release version), and I got: /usr/local/ghc/bin/ghc -o ghc-pkg.bin -H16m -O -cpp -Wall -fno-warn-name-shadowing -fno-warn-unused-matches -DUSING_COMPAT -i../../compat -ignore-package Cabal -Rghc-timing -package unix -L../../compat -lghccompat Main.o Version.o CRT_noglob.o Main.o: In function `__stginit_ZCMain': ghc13533.hc:(.text+0x4): undefined reference to `__DISCARD__' ghc13533.hc:(.text+0x9): undefined reference to `__DISCARD__' Main.o: In function `__stginit_Main': ghc13533.hc:(.text+0x18): undefined reference to `__DISCARD__' ghc13533.hc:(.text+0x1d): undefined reference to `__DISCARD__' Main.o: In function `__stginit_Main_': ghc13533.hc:(.text+0x2c): undefined reference to `__DISCARD__' Main.o:ghc13533.hc:(.text+0x3d): more undefined references to `__DISCARD__' follow collect2: ld returned 1 exit status <> Do you know how I can fix this problem? My ghc and gcc versions are: The Glorious Glasgow Haskell Compilation System, version 6.4.2 gcc (GCC) 4.1.1 20060724 (prerelease) (4.1.1-4pclos2007) Thanks! Di, Yu 7.19