--- configure.orig	2016-04-28 17:55:03 UTC
+++ configure
@@ -2380,7 +2380,7 @@ case $_host_os in
 		append_var LDFLAGS "-L$DEVKITPRO/libnds/lib"
 		append_var LIBS "-lnds9"
 		;;
-	freebsd*)
+	dragonfly*|freebsd*)
 		append_var LDFLAGS "-L/usr/local/lib"
 		append_var CXXFLAGS "-I/usr/local/include"
 		;;
@@ -3259,6 +3259,9 @@ case $_host_os in
 	android | beos* | bsd* | darwin* | freebsd* | gnu* | gph-linux | haiku* | hpux* | iphone | ios7 | irix*| k*bsd*-gnu* | linux* | maemo | mint* | netbsd* | openbsd* | solaris* | sunos* | uclinux* | webos)
 		_posix=yes
 		;;
+	dragonfly*)
+		_posix=yes
+		;;
 	os2-emx*)
 		_posix=yes	# FIXME: Really???
 		;;