Hi, I have the same problem both with the binary distribution and ghc compiled from macports/ darwinports, but only with ghci. If I compile things, it appears that things are linked properly. Has anyone found a solution for this, or does anyone have an idea of what I could try? Should this be reported as a bug? Launching ghci from an xterm window, I get $ ghci -package X11-1.1 ___ ___ _ / _ \ /\ /\/ __(_) / /_\// /_/ / / | | GHC Interactive, version 6.6, for Haskell 98. / /_\\/ __ / /___| | http://www.haskell.org/ghc/ \____/\/ /_/\____/|_| Type :? for help. Loading package base ... linking ... done. Loading package X11-1.1 ... ghc-6.6: can't load .so/.DLL for: X11 (dlopen(libX11.dylib, 10): image not found) I ran a ktrace to see where it was looking for the library, and got ... 381 ghc-6.6 CALL stat(0x1b057d8,0x1b05770) 381 ghc-6.6 NAMI "/opt/local/lib/ghc-6.6/libX11_dyn.dylib" 381 ghc-6.6 RET stat -1 errno 2 No such file or directory 381 ghc-6.6 CALL stat(0x1b05888,0x1b05820) 381 ghc-6.6 NAMI "/opt/local/lib/ghc-6.6/libX11.dylib" 381 ghc-6.6 RET stat -1 errno 2 No such file or directory 381 ghc-6.6 CALL open(0x1b058b8,0,0) 381 ghc-6.6 NAMI "libX11.dylib" 381 ghc-6.6 RET open -1 errno 2 No such file or directory 381 ghc-6.6 CALL close(0xffffffff) 381 ghc-6.6 RET close -1 errno 9 Bad file descriptor 381 ghc-6.6 CALL open(0xbfffd150,0,0) 381 ghc-6.6 NAMI "/Users/username/lib/libX11.dylib" 381 ghc-6.6 RET open -1 errno 2 No such file or directory 381 ghc-6.6 CALL close(0xffffffff) 381 ghc-6.6 RET close -1 errno 9 Bad file descriptor 381 ghc-6.6 CALL open(0xbfffd150,0,0) 381 ghc-6.6 NAMI "/usr/local/lib/libX11.dylib" 381 ghc-6.6 RET open -1 errno 2 No such file or directory 381 ghc-6.6 CALL close(0xffffffff) 381 ghc-6.6 RET close -1 errno 9 Bad file descriptor 381 ghc-6.6 CALL open(0xbfffd160,0,0) 381 ghc-6.6 NAMI "/usr/lib/libX11.dylib" 381 ghc-6.6 RET open -1 errno 2 No such file or directory 381 ghc-6.6 CALL close(0xffffffff) 381 ghc-6.6 RET close -1 errno 9 Bad file descriptor ... So it is not looking in /usr/X11R6/lib. I tried the same thing with DYLD_LIBRARY_PATH=/usr/X11R6/lib and get $ DYLD_LIBRARY_PATH=/usr/X11R6/lib ghci -package X11-1.1 ___ ___ _ / _ \ /\ /\/ __(_) / /_\// /_/ / / | | GHC Interactive, version 6.6, for Haskell 98. / /_\\/ __ / /___| | http://www.haskell.org/ghc/ \____/\/ /_/\____/|_| Type :? for help. Loading package base ... linking ... done. ghc-6.6: /opt/local/lib/ghc-6.6/HSX11_cbits.o: unknown symbol `_printf$LDBLStub' Loading package X11-1.1 ... linking ... ghc-6.6: unable to load package `X11-1.1' What's the problem? Thanks. Brad