$OpenBSD$

Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -155,7 +155,7 @@ else()
         src/Mem_unix.cpp
         )
 
-    set(EXTRA_LIBS pthread rt dl)
+    set(EXTRA_LIBS pthread )
 endif()
 
 if (CMAKE_SYSTEM_NAME STREQUAL FreeBSD)