Index: src/OSD/OSD_Chronometer.cxx
--- src/OSD/OSD_Chronometer.cxx.orig
+++ src/OSD/OSD_Chronometer.cxx
@@ -49,7 +49,7 @@
 
 void OSD_Chronometer::GetProcessCPU(Standard_Real& theUserSeconds, Standard_Real& theSystemSeconds)
 {
-  #if defined(__linux__) || defined(__FreeBSD__) || defined(__ANDROID__) || defined(__QNX__)       \
+  #if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__ANDROID__) || defined(__QNX__)       \
     || defined(__EMSCRIPTEN__)
   static const long aCLK_TCK = sysconf(_SC_CLK_TCK);
   #else
