--- CMakeLists.txt.orig	2017-04-02 17:44:42 UTC
+++ CMakeLists.txt
@@ -111,7 +111,7 @@ IF ("${CMAKE_SYSTEM_NAME}" MATCHES "Darw
 ENDIF()
 
 SET(LINUX FALSE)
-IF ("${CMAKE_SYSTEM_NAME}" MATCHES "Linux|FreeBSD")
+IF ("${CMAKE_SYSTEM_NAME}" MATCHES "Linux|FreeBSD|DragonFly")
     SET(LINUX TRUE)
 ENDIF()