I'm trying to compile mplayerplugin. Below are my results. This line is near the end. ================= skipping incompatible /usr/X11R6/lib64/libX11.a when searching for -lX11 ================= This is how I started. ================= ./configure --enable-libsuffix=64 --with-gecko-sdk=/usr/local/gecko-sdk --enable-x86_64 --with-x11libdir=/usr/X11/lib64 ================= David sHP:/home/david/download/tarball/mplayerplug-in # make g++ -shared -o mplayerplug-in.so plugin.o nsScriptablePeer.o npp_gate.o np_entry.o npn_gate.o plugin-support.o plugin-setup.o plugin-list.o plugin-ui.o plugin-threads.o strlcpy.o strlcat.o -Wall -g -O2 -I/usr/X11R6/include -g -O2 -m32 -DXP_UNIX -DMOZ_X11 -I/usr/local/gecko-sdk -I/usr/local/gecko-sdk/include -Iinclude -fPIC -DXPCOM_GLUE -DMOZILLA_STRICT_API -DXTHREADS -D_REENTRANT -DXUSE_MTSAFE_API -I/opt/gnome/include/gtk-2.0 -I/opt/gnome/lib64/gtk-2.0/include -I/usr/X11R6/include -I/opt/gnome/include/atk-1.0 -I/opt/gnome/include/pango-1.0 -I/usr/include/freetype2 -I/usr/include/freetype2/config -I/opt/gnome/include/glib-2.0 -I/opt/gnome/lib64/glib-2.0/include -pthread -I/opt/gnome/include/glib-2.0 -I/opt/gnome/lib64/glib-2.0/include -DGTK_ENABLED -melf_i386 -L/usr/X11R6/lib64 -lX11 -lSM -lICE -lXext -lX11 -lXpm -lXt -L /usr/local/gecko-sdk/lib -lxpcomglue -L /usr/local/gecko-sdk/bin -lnspr4 -lplds4 -Wl,--export-dynamic -L/opt/gnome/lib64 -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lm -lpangoxft-1.0 -lpangox-1.0 -lpango-1.0 -lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0 -pthread -L/opt/gnome/lib64 -lgthread-2.0 -lglib-2.0 /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.4/../../../../x86_64-suse-linux/bin/ld: skipping incompatible /usr/X11R6/lib64/libX11.so when searching for -lX11 /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.4/../../../../x86_64-suse-linux/bin/ld: skipping incompatible /usr/X11R6/lib64/libX11.a when searching for -lX11 /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.4/../../../../x86_64-suse-linux/bin/ld: cannot find -lX11 collect2: ld returned 1 exit status make: *** [mplayerplug-in.so] Error 1