diff --git a/gnu/lib/libdialog/Makefile b/gnu/lib/libdialog/Makefile
index 5d1c84b4e304..0985d2dc5593 100644
--- a/gnu/lib/libdialog/Makefile
+++ b/gnu/lib/libdialog/Makefile
@@ -12,7 +12,7 @@ SRCS=		arrows.c buttons.c calendar.c checklist.c columns.c dlg_keys.c \
 INCS=		dialog.h dlg_colors.h dlg_config.h dlg_keys.h
 MAN=		dialog.3
 
-CFLAGS+= 	-I${.CURDIR} -I${DIALOG}
+CFLAGS+= 	-I${.CURDIR} -I${DIALOG} -D_XOPEN_SOURCE_EXTENDED
 .PATH:		${DIALOG}
 WARNS?=		3
 
diff --git a/gnu/lib/libdialog/dlg_config.h b/gnu/lib/libdialog/dlg_config.h
index ffe205b9535b..4dd6ab44eff2 100644
--- a/gnu/lib/libdialog/dlg_config.h
+++ b/gnu/lib/libdialog/dlg_config.h
@@ -5,12 +5,10 @@
  * $FreeBSD$
  */
 
-
 #define DIALOG_PATCHDATE 20100428
 #define DIALOG_VERSION "1.1"
 #define HAVE_ALLOCA 1
 #define HAVE_COLOR 1
-#define HAVE_CURSES_H 1
 #define HAVE_DIRENT_H 1
 #define HAVE_DLG_FORMBOX 1
 #define HAVE_DLG_GAUGE 1
@@ -41,6 +39,7 @@
 #define HAVE_INTTYPES_H 1
 #define HAVE_LANGINFO_CODESET 1
 #define HAVE_LC_MESSAGES 1
+#define HAVE_LIBNCURSESW 1
 #define HAVE_LIMITS_H 1
 #define HAVE_LOCALE_H 1
 #define HAVE_MBSTATE_T 1
@@ -89,3 +88,4 @@
 #define SYSTEM_NAME "freebsd9.0"
 #define TIME_WITH_SYS_TIME 1
 #define TYPE_CHTYPE_IS_SCALAR 1
+#define USE_WIDE_CURSES 1