Index: src/OSD/OSD_Path.cxx
--- src/OSD/OSD_Path.cxx.orig
+++ src/OSD/OSD_Path.cxx
@@ -21,9 +21,11 @@
 #include <Standard_ProgramError.hxx>
 #include <TCollection_AsciiString.hxx>
 
+#include <sys/utsname.h> // For 'uname'
+
 static OSD_SysType whereAmI()
 {
-#if defined(__digital__) || defined(__FreeBSD__) || defined(SUNOS) || defined(__APPLE__) || defined(__QNX__) || defined(__FreeBSD_kernel__)
+#if defined(__digital__) || defined(__FreeBSD__) || defined(SUNOS) || defined(__APPLE__) || defined(__QNX__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
   return OSD_UnixBSD;
 #elif defined(sgi)  || defined(IRIX) || defined(__sun)  || defined(SOLARIS) ||  defined(__sco__) || defined(__hpux) || defined(HPUX)
   return OSD_UnixSystemV;