diff --git a/trunk/configure.in b/trunk/configure.in
index debec35..5b79884 100644
--- a/trunk/configure.in
+++ b/trunk/configure.in
@@ -106,6 +106,7 @@ AC_CHECK_HEADERS([ \
 	utmp.h \
 	utmpx.h \
 	wctype.h \
+	vis.h \
 ])
 
 case "$host" in
@@ -360,6 +361,7 @@ AC_CHECK_FUNCS([ \
 	strerror \
 	strlcat \
 	strlcpy \
+	strnvis \
 	strrchr \
 	strstr \
 	strtol \
diff --git a/trunk/include/sj3compat/sj3compat.h b/trunk/include/sj3compat/sj3compat.h
index dc625f0..ef5b018 100644
--- a/trunk/include/sj3compat/sj3compat.h
+++ b/trunk/include/sj3compat/sj3compat.h
@@ -125,4 +125,10 @@ size_t sj3_strlcat(char *, const char *, size_t);
 size_t sj3_strlcpy(char *, const char *, size_t);
 #endif
 
+/* vis.c */
+#ifndef HAVE_STRNVIS
+#define strnvis		sj3strnvis
+int strnvis(char *, const char *, size_t, int);
+#endif
+
 #endif /* SJ3COMPAT_H */
diff --git a/trunk/lib/sj3compat/Makefile.am b/trunk/lib/sj3compat/Makefile.am
index a83e35c..b614d34 100644
--- a/trunk/lib/sj3compat/Makefile.am
+++ b/trunk/lib/sj3compat/Makefile.am
@@ -13,4 +13,6 @@ libsj3compat_la_SOURCES = \
 	inet_ntoa.c \
 	setproctitle.c \
 	strlcat.c \
-	strlcpy.c
+	strlcpy.c \
+	vis.c
+