BlitzMax does not compile

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hello!

i am using ubuntu 64-bit and have no problem with it except blitzmax. i can run maxide, but if i try to compile sth. lets say print "hello" i will get the following error:

Building untitled1
Compiling:untitled1.bmx
flat assembler version 1.64
3 passes, 2840 bytes.
Linking:untitled1.debug
/usr/bin/ld: skipping incompatible /usr/lib/libX11.so when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/lib/libX11.a when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/lib/gcc-lib/x86_64-linux-gnu/3.3.6/../../../../lib/libX11.so when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/lib/gcc-lib/x86_64-linux-gnu/3.3.6/../../../../lib/libX11.a when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/lib/gcc-lib/x86_64-linux-gnu/3.3.6/../../../libX11.so when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/lib/gcc-lib/x86_64-linux-gnu/3.3.6/../../../libX11.a when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/lib/../lib/libX11.so when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/lib/../lib/libX11.a when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/bin/../lib/libX11.so when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/bin/../lib/libX11.a when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/lib/libX11.so when searching for -lX11
/usr/bin/ld: skipping incompatible /usr/lib/libX11.a when searching for -lX11
/usr/bin/ld: cannot find -lX11
collect2: ld returned 1 exit status
Build Error: Failed to link /home/stephan/BlitzMax118_Linux/BlitzMax/tmp/untitled1.debug
Process complete




i do not know how to solve this. i have gcc3.3 and 32bit libs installed.
:-\