Determine HZ exactly as in apps/speed.c.

crypto/tmdiff.c

@@ -59,6 +59,9 @@
 #include <stdlib.h>
 #include "cryptlib.h"
 #include <openssl/tmdiff.h>
+#if !defined(OPENSSL_SYS_MSDOS)
+#include OPENSSL_UNISTD
+#endif
 
 #ifdef TIMEB
 #undef OPENSSL_SYS_WIN32
@@ -101,6 +104,10 @@
 
 /* The following if from times(3) man page.  It may need to be changed */
 #ifndef HZ
+# if defined(_SC_CLK_TCK) \
+     && (!defined(OPENSSL_SYS_VMS) || __CTRL_VER >= 70000000)
+#  define HZ ((double)sysconf(_SC_CLK_TCK))
+# else
 #  ifndef CLK_TCK
 #   ifndef _BSD_CLK_TCK_ /* FreeBSD hack */
 #    define HZ  100.0
@@ -110,6 +117,7 @@
 #  else /* CLK_TCK */
 #   define HZ ((double)CLK_TCK)
 #  endif
+# endif
 #endif
 
 typedef struct ms_tm