diff --git a/applications/present3D/Cluster.cpp b/applications/present3D/Cluster.cpp
index 1b746a167..361dfe862 100644
--- a/applications/present3D/Cluster.cpp
+++ b/applications/present3D/Cluster.cpp
@@ -33,7 +33,7 @@
 #if defined(__linux)
     #include <unistd.h>
     #include <linux/sockios.h>
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
     #include <unistd.h>
     #include <sys/sockio.h>
 #elif defined(__sgi)
@@ -336,7 +336,8 @@ void Receiver::sync( void )
         return;
     }
 
-#if defined(__linux) || defined(__FreeBSD__) || defined( __APPLE__ )
+#if defined(__linux) || defined(__FreeBSD__) || defined( __APPLE__ ) || \
+    defined(__DragonFly__)
     socklen_t 
 #else
     int
diff --git a/src/osgDB/FileUtils.cpp b/src/osgDB/FileUtils.cpp
index a018675d6..3ecd24e3c 100644
--- a/src/osgDB/FileUtils.cpp
+++ b/src/osgDB/FileUtils.cpp
@@ -76,7 +76,8 @@ typedef char TCHAR;
     #if (MAC_OS_X_VERSION_MAX_ALLOWED <= 1040)
         #define stat64 stat
     #endif
-#elif defined(__CYGWIN__) || defined(__FreeBSD__) || (defined(__hpux) && !defined(_LARGEFILE64_SOURCE))
+#elif defined(__CYGWIN__) || defined(__FreeBSD__) || defined(__DragonFly__) || \
+      (defined(__hpux) && !defined(_LARGEFILE64_SOURCE))
     #define stat64 stat
 #endif