Index: openacs-4/packages/xotcl-request-monitor/www/index.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-request-monitor/www/index.tcl,v
diff -u -r1.24.2.5 -r1.24.2.6
--- openacs-4/packages/xotcl-request-monitor/www/index.tcl	18 Jan 2017 08:13:55 -0000	1.24.2.5
+++ openacs-4/packages/xotcl-request-monitor/www/index.tcl	20 Jun 2017 19:46:11 -0000	1.24.2.6
@@ -45,7 +45,13 @@
   if {![catch {exec sysctl vm.loadavg kern.boottime} result]} {
       return $result
   }
-  return [exec /usr/bin/uptime]
+  if {[set uptime [util::which uptime]] ne ""} {
+    return [exec $uptime]    
+  } else {
+    set msg "'uptime' command not found on the system"
+    ad_log error $msg
+    return ""
+  }  
 }
 
 # collect current response time (per minute and hour)