Ubuntu 8.0.4 x64 -lX11 incompatibility issues

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Pragun

I tried installing all of the required libraries (I don't know that much about linux). heres my output when i try to compile:

Building functions
Compiling:functions.bmx
flat assembler version 1.64
3 passes, 15373 bytes.
Linking:functions.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 /media/disk/Users/Pragun/Desktop/ver16/boxed-new/functions.debug
Process complete

does anyone know how to go about taking care of that?