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Asked: 2026-05-10T19:05:44+00:00

I’m trying to compile a program called ngrep, and when I ran configure, things

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I’m trying to compile a program called ngrep, and when I ran configure, things seemed to go well, but when I run make, I get:

ngrep.c: In function ‘process’: ngrep.c:544: error: ‘struct udphdr’ has no member named ‘source’ ngrep.c:545: error: ‘struct udphdr’ has no member named ‘dest’ make: *** [ngrep.o] Error 1

What does that mean, and how do I fix it? There are no earlier warnings or errors that suggest the root of the problem.

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1 Answer

  1. Found the problem:

    #ifdef HAVE_DUMB_UDPHDR                 printf('%s:%d -', inet_ntoa(ip_packet->ip_src), ntohs(udp->source));                 printf('> %s:%d', inet_ntoa(ip_packet->ip_dst), ntohs(udp->dest)); #else                 printf('%s:%d -', inet_ntoa(ip_packet->ip_src), ntohs(udp->uh_sport));                 printf('> %s:%d', inet_ntoa(ip_packet->ip_dst), ntohs(udp->uh_dport)); #endif

    Apparently, configure has a bug in this test, and it thinks my system has the ‘dumb’ udphdr, even though it doesn’t. Changing the first line to ‘#if 0’ fixes the problem.

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