sockio.h is required on OpenSolaris for SIOCGIFADDR.

configure.in

@@ -877,6 +877,7 @@ AC_TRY_COMPILE(
 AC_CHECK_FUNCS(prctl)
 AC_CHECK_FUNCS(gethostbyname_r)
 
+AC_CHECK_HEADERS(sys/sockio.h)
 AC_CHECK_HEADERS(net/pfkeyv2.h netipsec/ipsec.h netinet6/ipsec.h linux/udp.h)
 
 AC_CHECK_MEMBERS([struct sockaddr.sa_len], [], [],

src/starter/interfaces.c

@@ -14,6 +14,10 @@
 
 #include <sys/socket.h>
 #include <sys/ioctl.h>
+#ifdef HAVE_SYS_SOCKIO_H
+#include <sys/sockio.h>
+#endif
+
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>