diff -rudpN emulators/dynagen.orig/files/patch-dynagen emulators/dynagen/files/patch-dynagen
--- emulators/dynagen.orig/files/patch-dynagen	1970-01-01 03:00:00.000000000 +0300
+++ emulators/dynagen/files/patch-dynagen	2017-04-21 15:06:40.935141000 +0300
@@ -0,0 +1,19 @@
+--- dynagen.orig	2017-04-21 12:04:48 UTC
++++ dynagen
+@@ -947,6 +947,7 @@ class Dynagen:
+     def open_config(self, FILENAME):
+         """ Open the config file"""
+ 
++        global CONFIGSPECPATH
+         # look for configspec in CONFIGSPECPATH and the same directory as dynagen
+         realpath = os.path.realpath(sys.argv[0])
+         self.debug('realpath ' + realpath)
+@@ -1443,7 +1444,7 @@ class Dynagen:
+     def import_ini(self, FILENAME):
+         """ Read in the INI file"""
+ 
+-        global telnetstring
++        global telnetstring, INIPATH
+         # look for the INI file in the same directory as dynagen
+         realpath = os.path.realpath(sys.argv[0])
+         pathname = os.path.dirname(realpath)
diff -rudpN emulators/dynagen.orig/Makefile emulators/dynagen/Makefile
--- emulators/dynagen.orig/Makefile	2017-04-21 15:25:44.970196000 +0300
+++ emulators/dynagen/Makefile	2017-04-22 11:48:17.847886000 +0300
@@ -3,7 +3,7 @@
 
 PORTNAME=	dynagen
 PORTVERSION=	0.11.0
-PORTREVISION=	4
+PORTREVISION=	5
 CATEGORIES=	emulators
 MASTER_SITES=	SF/dyna-gen/${PORTNAME}%20source%20_%20Linux/${PORTNAME}%20${PORTVERSION}
 
@@ -21,24 +21,35 @@ PORTDOCS=	*
 PORTEXAMPLES=	*
 PORTDATA=	*
 
-USES=		dos2unix python shebangfix
+USES=		dos2unix shebangfix
 SHEBANG_FILES=	*.py dynagen
 
 USE_PYTHON=	distutils autoplist
 ALL_TARGET=	# empty
 NO_ARCH=	yes
 
-.include <bsd.port.pre.mk>
+OPTIONS_SINGLE=	PY
+PY_DESC=	Choose Python version
+OPTIONS_DEFAULT=	PYTHON2
+OPTIONS_SINGLE_PY=	PYTHON2 PYTHON3
+PYTHON2_USES=	python:2
+PYTHON3_USES=	python:3
+
+.include <bsd.port.options.mk>
 
 post-extract:
 	@${CP} ${FILESDIR}/setup.py ${WRKSRC}
 
 post-patch:
-.if ${PYTHON_MAJOR_VER} >= 3
-	@${ECHO_MSG} "===>   Converting to python${PYTHON_MAJOR_VER}"
+	${REINPLACE_CMD} -E \
+		-e "s|^(CONFIGSPECPATH = \[).*(])$$|\1 '${DATADIR}' \2|" \
+		-e "s|^(INIPATH = \[).*(])$$|\1 '${PREFIX}/etc' \2|" \
+		${WRKSRC}/dynagen
+
+post-patch-PYTHON3-on:
+	@${ECHO_MSG} "===> Converting to python${PYTHON_MAJOR_VER}"
 	${PYTHONBASE}/bin/2to3-${PYTHON_VER} --no-diffs --write ${WRKSRC} ${WRKSRC}/dynagen
-	@${ECHO_MSG} "===>   end of converting"
-.endif
+	@${ECHO_MSG} "===> end of converting"
 
 post-install:
 	${INSTALL_SCRIPT} ${WRKSRC}/dynagen ${STAGEDIR}${PREFIX}/bin
@@ -68,4 +79,4 @@ post-install:
 	${INSTALL_DATA} ${WRKSRC}/sample_labs/simple2/simple2.net ${STAGEDIR}${EXAMPLESDIR}/sample_labs/simple2
 	${INSTALL_DATA} ${WRKSRC}/sample_labs/all_config_options.txt ${STAGEDIR}${EXAMPLESDIR}/sample_labs
 
-.include <bsd.port.post.mk>
+.include <bsd.port.mk>