'socket nsl', checklibc=True,
headers='sys/socket.h netinet/in.h arpa/inet.h netdb.h')
+ # Some old Linux systems have broken header files and
+ # miss the IPV6_V6ONLY define in netinet/in.h,
+ # but have it in linux/in6.h.
+ # We can't include both files so we just check if the value
+ # if defined and do the replacement in system/network.h
+ if not conf.CHECK_VARIABLE('IPV6_V6ONLY',
+ headers='sys/socket.h netdb.h netinet/in.h'):
+ conf.CHECK_CODE('''
+ #include <linux/in6.h>
+ #if (IPV6_V6ONLY != 26)
+ #error no IPV6_V6ONLY support on linux
+ #endif
+ int main(void) { return IPV6_V6ONLY; }
+ ''',
+ define='HAVE_LINUX_IPV6_V6ONLY_26',
+ addmain=False,
+ msg='Checking for IPV6_V6ONLY in linux/in6.h',
+ local_include=False)
+
conf.CHECK_CODE('''
struct sockaddr_storage sa_store;
struct addrinfo *ai = NULL;