Configure: disabled IP_PKTINFO feature on certain platforms.
On Cygwin and NetBSD 7.0+ struct in_pktinfo has no ipi_spec_dst field, which
caused nginx compilation error. Now presence of this field is ensured by the
IP_PKTINFO feature test.
The problem was introduced by dbb0c854e308 (1.13.0).
diff --git a/auto/unix b/auto/unix
index 7c6a855..10835f6 100644
--- a/auto/unix
+++ b/auto/unix
@@ -428,7 +428,10 @@
#include <netinet/in.h>"
ngx_feature_path=
ngx_feature_libs=
-ngx_feature_test="setsockopt(0, IPPROTO_IP, IP_PKTINFO, NULL, 0)"
+ngx_feature_test="struct in_pktinfo pkt;
+ pkt.ipi_spec_dst.s_addr = INADDR_ANY;
+ (void) pkt;
+ setsockopt(0, IPPROTO_IP, IP_PKTINFO, NULL, 0)"
. auto/feature
