librb: acinclude: check for ipv6 on win32
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@ -38,8 +38,13 @@ dnl RB_PROTO_INET6
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AC_DEFUN([RB_PROTO_INET6],[
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AC_CACHE_CHECK([for INET6 protocol support], [rb_cv_proto_inet6],[
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AC_TRY_CPP([
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#ifndef _WIN32
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#include <sys/types.h>
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#include <sys/socket.h>
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#else
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#endif
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#ifndef PF_INET6
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#error Missing PF_INET6
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