How to build 32 bit version on Ubuntu 16

[CleverBoy]

Hi All.

I am trying to build 32 bit libraries of SFML on 64 bit linux Ubuntu. The error i am getting is

cmake -DCMAKE_CXX_FLAGS=m32 ..

CMake Error at /usr/share/cmake-3.5/Modules/FindX11.cmake:439 (message):
  Could not find X11
Call Stack (most recent call first):
  src/SFML/Window/CMakeLists.txt:199 (find_package)

Can anyone help to generate 32 bit libraries. I tried with version 2.3 and 2.4. Same error.

Thanks...