c - Does POSIX if.h require a library to use -

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does using posix header file #include <net/if.h> require library linked aswell? below error when use constant header file.

error: ifnamsiz undeclared

#include <net/if.h>  int main(int argc, char** argv) {     char f[ifnamsiz]; // compiler error     return 0; }

if need library, whats name of it? gcc -o test test.c -lif --std=c11 not valid library. googling turning nothing quite frustrating.

*ps: how find out libraries posix header requires?

solution: problem because compiling --std=c11. question describes problem , solution: why c99 complain storage sizes?

from quick google, seems name defined if_namesize, not ifnamsiz.

the error getting not missing library*, missing definition @ compiler step, means header file not define ifnamsiz.

*) if library issue, you'd see linker errors 'missing external symbol' messages.


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