[15:09:58] kamil:ubersystem:~> gcc foo.c -lX11
/usr/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../libX11.a(ConnDis.o)(.text+0xb13): In function `_X11TransConnectDisplay':
/home/X/lib/libX11-X11R7.0-1.0.0/src/ConnDis.c:1232: undefined reference to `XauDisposeAuth'
/usr/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../libX11.a(ConnDis.o)(.text+0xbe1):/home/X/lib/libX11-X11R7.0-1.0.0/src/ConnDis.c:1037: undefined reference to `XauGetBestAuthByAddr'
/usr/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../libX11.a(ConnDis.o)(.text+0xe3f):/home/X/lib/libX11-X11R7.0-1.0.0/src/ConnDis.c:1176: undefined reference to `XdmcpWrap'
collect2: ld returned 1 exit status