Index: src/common/compat.c
--- src/common/compat.c.orig
+++ src/common/compat.c
@@ -20,7 +20,8 @@
 #include "compat.h"
 
 #if (defined(__linux__) || defined(__GLIBC__) || defined(__FreeBSD__) || \
-		defined(__darwin__) || defined(__NetBSD__))
+		defined(__darwin__) || defined(__NetBSD__) || \
+		defined(__OpenBSD__))
 
 /*
  * Initialize a pthread mutex. This never fails.
@@ -97,4 +98,4 @@ void tsocks_once(tsocks_once_t *o, void (*init_routine
 	tsocks_mutex_unlock(&o->mutex);
 }
 
-#endif /* __linux__, __GLIBC__, __darwin__, __FreeBSD__, __NetBSD__ */
+#endif /* __linux__, __GLIBC__, __darwin__, __FreeBSD__, __NetBSD__, __OpenBSD__ */