#ifndef _BOOLEAN_
#define _BOOLEAN_
-#if (defined(sun) && OSMAJORVERSION <= 5 && OSMINORVERSION <= 3)|| defined(USL)
+#if (defined(sun) && OSMAJORVERSION <= 5 && OSMINORVERSION <= 3)
#include <sys/types.h>
#define boolean boolean_t
#define true B_TRUE