diff --git a/devel/ftjam/Makefile b/devel/ftjam/Makefile
index 39f15a24b434..80ac40d95272 100644
--- a/devel/ftjam/Makefile
+++ b/devel/ftjam/Makefile
@@ -12,7 +12,7 @@ COMMENT=	Small build tool that can be used as a replacement for make(1)
 OPTIONS_DEFINE=	DOCS
 
 USES=		dos2unix gmake tar:bzip2
-DOS2UNIX_GLOB=	*.c
+DOS2UNIX_GLOB=	*.c jam.h
 
 PORTDOCS=	Jam.html \
 		Jambase.html \
diff --git a/devel/ftjam/files/patch-jam.h b/devel/ftjam/files/patch-jam.h
new file mode 100644
index 000000000000..e91edc97d8fa
--- /dev/null
+++ b/devel/ftjam/files/patch-jam.h
@@ -0,0 +1,11 @@
+--- jam.h.orig	2015-11-13 12:38:24 UTC
++++ jam.h
+@@ -227,7 +227,7 @@
+ # define OSMINOR "OS=CYGWIN"
+ # define OS_CYGWIN
+ # endif
+-# ifdef __FreeBSD__
++# if defined __FreeBSD__ || defined __DragonFly__
+ # define OSMINOR "OS=FREEBSD"
+ # define OS_FREEBSD
+ # endif