cpu_vendor - Contains the CPU vendor name. Allegro game programming library.

       On  Intel  PCs,  contains  the CPU vendor name if known. On Mac OSX systems this contains the PPC subtype
       name. On other platforms, this may be an empty string. You can read this variable after you  have  called
       check_cpu() (which is automatically called by allegro_init()).

       cpu_vendor - Contains the CPU vendor name. Allegro game programming library.

check_cpu(3alleg4),       cpu_family(3alleg4),       cpu_model(3alleg4),       cpu_capabilities(3alleg4),
       allegro_init(3alleg4)

Allegro                                           version 4.4.3                              cpu_vendor(3alleg4)

#include<allegro.h>externcharcpu_vendor[];