David Brownell submitted a new applet, zcip, based on RFC 3927. This is

version 0418b.  It compiled.

include/applets.h

@@ -692,6 +692,9 @@
 #ifdef CONFIG_GUNZIP
 	APPLET(zcat, gunzip_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif
+#ifdef CONFIG_ZCIP
+	APPLET(zcip, zcip_main, _BB_DIR_SBIN, _BB_SUID_NEVER)
+#endif
 
 #if !defined(PROTOTYPES) && !defined(MAKE_USAGE)
 	{ 0,NULL,0 }

include/usage.h

@@ -3038,4 +3038,14 @@
 #define zcat_full_usage \
 	"Uncompress to stdout."
 
+#define zcip_trivial_usage \
+	"[OPTIONS] ifname script"
+#define zcip_full_usage \
+	"zcip manages a ZeroConf IPv4 link-local address.\n" \
+	"Options:\n" \
+	"\t-f              foreground mode\n" \
+	"\t-q              quit after address (no daemon)\n" \
+	"\t-r 169.254.x.x  request this address first\n" \
+	"\t-v              verbose; show version\n"
+
 #endif /* __BB_USAGE_H__ */