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diff -up ./interface/tuntap/test/TUNTools.h.gcc10 ./interface/tuntap/test/TUNTools.h
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--- ./interface/tuntap/test/TUNTools.h.gcc10	2020-01-23 00:49:32.396175244 -0500
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+++ ./interface/tuntap/test/TUNTools.h	2020-01-23 00:50:00.026580841 -0500
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@@ -29,9 +29,9 @@ typedef Iface_DEFUN (* TUNTools_Callback
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 Iface_DEFUN TUNTools_genericIP6Echo(struct Message* msg, struct TUNTools* tt);
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-const uint8_t* TUNTools_testIP6AddrA;
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-const uint8_t* TUNTools_testIP6AddrB;
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-const uint8_t* TUNTools_testIP6AddrC;
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+extern const uint8_t* TUNTools_testIP6AddrA;
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+extern const uint8_t* TUNTools_testIP6AddrB;
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+extern const uint8_t* TUNTools_testIP6AddrC;
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 struct TUNTools
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 {
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diff -up ./util/platform/Sockaddr.h.gcc10 ./util/platform/Sockaddr.h
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--- ./util/platform/Sockaddr.h.gcc10	2019-11-25 06:38:10.000000000 -0500
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+++ ./util/platform/Sockaddr.h	2020-01-23 00:41:54.026444061 -0500
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@@ -50,11 +50,11 @@ struct Sockaddr_storage
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 };
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 /** 127.0.0.1 and ::1 addresses for building from. */
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-const struct Sockaddr* const Sockaddr_LOOPBACK_be;
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-const struct Sockaddr* const Sockaddr_LOOPBACK_le;
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+extern const struct Sockaddr* const Sockaddr_LOOPBACK_be;
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+extern const struct Sockaddr* const Sockaddr_LOOPBACK_le;
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 #define Sockaddr_LOOPBACK (Endian_isBigEndian() ? Sockaddr_LOOPBACK_be : Sockaddr_LOOPBACK_le)
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-const struct Sockaddr* const Sockaddr_LOOPBACK6;
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+extern const struct Sockaddr* const Sockaddr_LOOPBACK6;
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 int Sockaddr_getPrefix(struct Sockaddr* addr);
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diff -up ./util/platform/Socket.h.gcc10 ./util/platform/Socket.h
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--- ./util/platform/Socket.h.gcc10	2020-01-23 00:45:55.522991656 -0500
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+++ ./util/platform/Socket.h	2020-01-23 00:46:13.753259267 -0500
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@@ -39,8 +39,8 @@ int Socket_recvfrom(int fd,
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 int Socket_connect(int fd, const struct Sockaddr* sa, struct Allocator* alloc);
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-const int Socket_SOCK_DGRAM;
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-const int Socket_SOCK_STREAM;
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+extern const int Socket_SOCK_DGRAM;
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+extern const int Socket_SOCK_STREAM;
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 int Socket_socket(int af, int type, int protocol, struct Allocator* alloc);
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 int Socket_bind(int fd, const struct Sockaddr* sa);