After uninstalling XFree86 and installing Apple's X11, new packages were unable to find the X11 include files: $ sudo port install libmpeg2 ---> Fetching libsdl ---> Attempting to fetch SDL-1.2.11.tar.gz from http://www.libsdl.org/release/ ---> Verifying checksum(s) for libsdl ---> Extracting libsdl ---> Applying patches to libsdl ---> Configuring libsdl ---> Building libsdl with target all Error: Target com.apple.build returned: shell command " cd "/opt/local/var/db/dports/build/_opt_local_var_db_dports_sources_rsync.rsync.darwinports.org_dpupdate_dports_devel_libsdl/work/SDL-1.2.11" && make all " returned error 2 Command output: ./include/SDL_syswm.h:55:22: error: X11/Xlib.h: No such file or directory ./include/SDL_syswm.h:56:23: error: X11/Xatom.h: No such file or directory As a workaround, I did this: cd /usr/X11R6/include sudo mv X11 X11-bitmaps sudo ln -s /Developer/SDKs/MacOSX10.4u.sdk/usr/X11R6/include/X11 X11 This allows libsdl to compile. What is the correct way to do this? Is there something like a ld.conf file somewhere? Dave