diff -uNr qtbase/src/network/kernel/qhostinfo_unix.cpp qtbase.mod/src/network/kernel/qhostinfo_unix.cpp
--- qtbase/src/network/kernel/qhostinfo_unix.cpp	2018-09-13 07:25:10.000000000 +0300
+++ qtbase.mod/src/network/kernel/qhostinfo_unix.cpp	2018-09-21 16:25:01.061996160 +0300
@@ -84,6 +84,61 @@
     NeedResNInit
 };
 
+#include <sys/types.h>
+#include <linux/in.h>
+
+/* res_state: the global state used by the resolver stub.  */
+#define MAXNS           3   /* max # name servers we'll track */
+#define MAXDFLSRCH      3   /* # default domain levels to try */
+#define MAXDNSRCH       6   /* max # domains in search path */
+#define MAXRESOLVSORT       10  /* number of net to sort on */
+
+struct __res_state {
+    int retrans;        /* retransmition time interval */
+    int retry;          /* number of times to retransmit */
+    unsigned long options;      /* option flags - see below. */
+    int nscount;        /* number of name servers */
+    struct sockaddr_in
+        nsaddr_list[MAXNS]; /* address of name server */
+    unsigned short id;      /* current message id */
+    /* 2 byte hole here.  */
+    char    *dnsrch[MAXDNSRCH+1];   /* components of domain to search */
+    char    defdname[256];      /* default domain (deprecated) */
+    unsigned long pfcode;       /* RES_PRF_ flags - see below. */
+    unsigned ndots:4;       /* threshold for initial abs. query */
+    unsigned nsort:4;       /* number of elements in sort_list[] */
+    unsigned ipv6_unavail:1;    /* connecting to IPv6 server failed */
+    unsigned unused:23;
+    struct {
+        struct in_addr  addr;
+        uint32_t    mask;
+    } sort_list[MAXRESOLVSORT];
+    /* 4 byte hole here on 64-bit architectures.  */
+    void * __glibc_unused_qhook;
+    void * __glibc_unused_rhook;
+    int res_h_errno;        /* last one set for this context */
+    int _vcsock;        /* PRIVATE: for res_send VC i/o */
+    unsigned int _flags;        /* PRIVATE: see below */
+    /* 4 byte hole here on 64-bit architectures.  */
+    union {
+        char    pad[52];    /* On an i386 this means 512b total. */
+        struct {
+            uint16_t        nscount;
+            uint16_t        nsmap[MAXNS];
+            int         nssocks[MAXNS];
+            uint16_t        nscount6;
+            uint16_t        nsinit;
+            struct sockaddr_in6 *nsaddrs[MAXNS];
+#ifdef _LIBC
+            unsigned long long int __glibc_extension_index
+              __attribute__((packed));
+#else
+            unsigned int        __glibc_reserved[2];
+#endif
+        } _ext;
+    } _u;
+};
+
 typedef struct __res_state *res_state_ptr;
 
 typedef int (*res_init_proto)(void);