Index: src/System/Link/cmdline_link.cpp
--- src/System/Link/cmdline_link.cpp.orig
+++ src/System/Link/cmdline_link.cpp
@@ -36,7 +36,7 @@ namespace wsoc {
 #define TM_FD_SET(fd, set) FD_SET((u_int) fd, set)
 #endif // OS_MINGW
 
-#if !defined(__APPLE__) && !defined(__FreeBSD__)
+#if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__OpenBSD__)
 #include <malloc.h>
 #endif
 
