Index: prnt/hpcups/ErnieFilter.cpp
--- prnt/hpcups/ErnieFilter.cpp.orig
+++ prnt/hpcups/ErnieFilter.cpp
@@ -34,7 +34,7 @@
 #include "ErnieFilter.h"
 
 
-#if defined(__APPLE__) || defined(__linux) || defined(__GLIBC__) || defined(__NetBSD__)
+#if defined(__APPLE__) || defined(__linux) || defined(__GLIBC__) || defined(__NetBSD__) || defined(__OpenBSD__)
 #include <math.h>
 #endif
 
