Index: src/platform.h
==================================================================
--- src/platform.h
+++ src/platform.h
@@ -82,12 +82,16 @@
 # endif
 #elif defined(__linux__)
 # define OF_LINUX
 #elif defined(_WIN32)
 # define OF_WINDOWS
+#elif defined(__FreeBSD__)
+# define OF_FREEBSD
 #elif defined(__NetBSD__)
 # define OF_NETBSD
+#elif defined(__OpenBSD__)
+# define OF_OPENBSD
 #elif defined(__DragonFly__)
 # define OF_DRAGONFLYBSD
 #elif defined(__HAIKU__)
 # define OF_HAIKU
 #elif defined(__sun__)