--- origsrc/unbound-1.19.1/libunbound/libunbound.c	2024-02-21 10:06:14.070706000 +0900
+++ src/unbound-1.19.1/libunbound/libunbound.c	2024-02-21 10:20:57.101941000 +0900
@@ -76,7 +76,7 @@
 #include <time.h>
 #endif
 
-#if defined(UB_ON_WINDOWS) && defined (HAVE_WINDOWS_H) || defined(__CYGWIN__)
+#if defined(UB_ON_WINDOWS) && defined (HAVE_WINDOWS_H)
 #include <windows.h>
 #include <iphlpapi.h>
 #endif /* UB_ON_WINDOWS */
@@ -1139,7 +1139,7 @@ ub_ctx_resolvconf(struct ub_ctx* ctx, co
 	}
 	in = fopen(fname, "r");
 	if(!in) {
-#if defined(UB_ON_WINDOWS) || defined(HAVE_WINDOWS_H) || defined(__CYGWIN__)
+#if defined(UB_ON_WINDOWS) || defined(HAVE_WINDOWS_H)
 		FIXED_INFO *info;
 		ULONG buflen = sizeof(*info);
 		IP_ADDR_STRING *ptr;