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diff -up tftp-hpa-5.2/tftp/tftp.c.gcc10 tftp-hpa-5.2/tftp/tftp.c
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--- tftp-hpa-5.2/tftp/tftp.c.gcc10	2020-05-04 00:56:28.787896509 +0200
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+++ tftp-hpa-5.2/tftp/tftp.c	2020-05-04 00:58:42.502901005 +0200
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@@ -48,7 +48,7 @@ extern int maxtimeout;
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 #define PKTSIZE    SEGSIZE+4
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 char ackbuf[PKTSIZE];
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 int timeout;
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-sigjmp_buf toplevel;
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+extern sigjmp_buf toplevel;
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 sigjmp_buf timeoutbuf;
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 static void nak(int, const char *);