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AC_DEFUN([rk_SUNOS],[
sunos=no
case "$host" in 
*-*-solaris2.7)
	sunos=57
	;;
*-*-solaris2.1[[1-9]])
	AC_DEFINE([__EXTENSIONS__], [1],
		  [Enable general extensions on Solaris.])
	AC_DEFINE([_STDC_C11_BCI], [1],
		[Enable C11 prototypes for memset_s and friends])
	sunos=511
	;;
*-*-solaris2.[[89]] | *-*-solaris2.10)
	sunos=58
	;;
*-*-solaris2*)
	sunos=50
	;;
esac
if test "$sunos" != no; then
	AC_DEFINE_UNQUOTED(SunOS, $sunos, 
		[Define to what version of SunOS you are running.])
fi
])