Just make sure you can compile both 64bit and 32-bit versions
 
  32-bit is still prevalent, but 64-bit is where things are headed due to RAM addressing beyond 4GB.
  32-bit is still prevalent, but 64-bit is where things are headed due to RAM addressing beyond 4GB. 
  32-bit is still prevalent, but 64-bit is where things are headed due to RAM addressing beyond 4GB.
  32-bit is still prevalent, but 64-bit is where things are headed due to RAM addressing beyond 4GB.