Fix compile on QNX. Thanks to Will Miles.

configure

@@ -506,6 +506,9 @@ if $XCC _inet_ntoa.c -o _inet_ntoa 2>&3; then
 elif $XCC _inet_ntoa.c -lnsl -o _inet_ntoa 2>&3; then
 	echo "yes (-lnsl)"
 	echo "LDADD+=		-lnsl" >>$CONFIG_MK
+elif $XCC _inet_ntoa.c -lsocket -o _inet_ntoa 2>&3; then
+	echo "yes (-lsocket)"
+	echo "LDADD+=		-lsocket" >>$CONFIG_MK	
 else
 	echo "no"
 	echo "libc support for inet_ntoa is required - aborting" >&2

if.c

@@ -70,6 +70,11 @@
 #include "ipv4.h"
 #include "ipv6nd.h"
 
+#ifdef __QNX__
+/* QNX carries defines for, but does not actually support PF_LINK */
+#undef IFLR_ACTIVE
+#endif
+
 void
 if_free(struct interface *ifp)
 {

ipv6.c

@@ -48,15 +48,17 @@
 #    define IN6_IFF_DUPLICATED	0x08
 #  endif
 #  define IN6_IFF_DETACHED	0
-#else
-#  include <sys/endian.h>
+#else /* !__linux__ */
+#  ifndef __QNX__
+#    include <sys/endian.h>
+#  endif
 #  include <net/if.h>
-#ifdef __FreeBSD__ /* Needed so that including netinet6/in6_var.h works */
-#  include <net/if_var.h>
-#endif
-#ifndef __sun
-#  include <netinet6/in6_var.h>
-#endif
+#  ifdef __FreeBSD__ /* Needed so that including netinet6/in6_var.h works */
+#    include <net/if_var.h>
+#  endif
+#  ifndef __sun
+#    include <netinet6/in6_var.h>
+#  endif
 #endif
 
 #include <errno.h>