-add_executable(odhcp6c src/odhcp6c.c src/dhcpv6.c src/ra.c src/script.c src/md5.c)
-target_link_libraries(odhcp6c resolv)
+set(SOURCES src/odhcp6c.c src/dhcpv6.c src/ra.c src/script.c)
+if(LIBUBOX EQUAL 0)
+ set(SOURCES ${SOURCES} src/md5.c)
+endif()
+add_executable(odhcp6c ${SOURCES})
+
+set(LIBRARIES resolv)
+if(LIBUBOX EQUAL 1)
+ set(LIBRARIES ${LIBRARIES} ubox)
+endif()
+target_link_libraries(odhcp6c ${LIBRARIES})