how to check 64bit or 32 bit machine?

[susan xie]

Hi, 

I want to use a third-party library in my Makefile.am. The static third party 
library is put in a directory with 2 sub-directories: 'linux' and 'linux64'.
On 64bit machine, my code needs to link with the static library in 'linux64' 
directory. While on 32 bit machine, it needs to link with the static library in 
'linux' directory.  Do you know how to check 64bit machine or 32 bit machine to 
finish this task? 

Thanks in advance. 

Ting 

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