--- lastcomm.c
+++ lastcomm.c
@@ -47,6 +47,7 @@
 #endif
 
 #include <pwd.h>
+#include <unistd.h>
 
 #include "common.h"
 #include "uid_hash.h"
@@ -65,7 +66,7 @@
 int strict_match_flag = 0;	/* Nonzero if each record has to match
 				   all items on the command line */
 int print_controls = 0;		/* don't print control characters */
-int ahz = AHZ;			/* for viewing logs from another system */
+int ahz = 0; 			/* for viewing logs from another system */
 
 char *program_name;		/* name of the program, for usage & errs */
 
@@ -91,6 +92,10 @@
 
 /* code */
 
+#ifndef HZ
+# define AHZ sysconf(_SC_CLK_TCK)
+#endif
+
 void
 main (int argc, char *argv[])
 {
@@ -98,6 +103,7 @@
   int other_pacct_file_specified = 0; /* nonzero if the user used the
 					 `-f' or `--file' flag */
 
+  ahz = AHZ;
   program_name = argv[0];
   
   /* Tell the pacct reader that we want to do things backwards! */
--- sa.c
+++ sa.c
@@ -174,7 +174,7 @@
 int print_users = 0;
 int percentages = 0;		/* include percentages in printout */
 int user_summary_flag = 0;	/* are we printing a user summary? */
-int ahz = AHZ;			/* for viewing logs from another system */
+int ahz = 0;			/* for viewing logs from another system */
 
 
 #if defined(HAVE_ACUTIME) && defined(HAVE_ACSTIME)
@@ -265,11 +265,16 @@
 
 /* code */
 
+#ifndef HZ
+# define AHZ sysconf(_SC_CLK_TCK)
+#endif
+
 void
 main (int argc, char *argv[])
 {
   int c;
 
+  ahz = AHZ;
   program_name = argv[0];
   
   /* Cache the page size of the machine for the PAGES_TO_KB macro */