warning: const is a keyword in ANSI C

While moving to compiler on Solaris machine if you encounter this warning

"warning: const is a keyword in ANSI C"

Check you this site:
http://www.fftw.org/faq/section2.html

" You should be aware that Solaris comes with two compilers, namely, /opt/SUNWspro/SC4.2/bin/cc and /usr/ucb/cc. The latter compiler is non-ANSI. Indeed, it is a perverse shell script that calls the real compiler in non-ANSI mode. In order to compile FFTW, change your path so that the right cc is used."