Just FYI, the _RESTRICT_KYWD is a macro declared in /usr/include/sys/feature_tests.h on newer (v10) Solaris systems (feature_tests.h itself is included from /usr/include/iso/stdio_iso.h):

/*
 * The following macro defines a value for the ISO C99 restrict
 * keyword so that _RESTRICT_KYWD resolves to "restrict" if
 * an ISO C99 compiler is used and "" (null string) if any other
 * compiler is used. This allows for the use of single prototype
 * declarations regardless of compiler version.
 */
#if (defined(__STDC__) && defined(_STDC_C99))
#define _RESTRICT_KYWD  restrict
#else
#define _RESTRICT_KYWD
#endif
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However, as plobsing hinted at, you can probably get away without it.

(This is a rather common source of various compilation problems, unfortunately.)