c - How can I compile code that uses getsubopt()? -

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i want parse list of options of form key1=val1, key2=val2, etc (like options mount -o). getsubopt() function seems perfect task (http://www.gnu.org/s/hello/manual/libc/suboptions.html). however, when try compile code using gcc, get:

warning: implicit declaration of function ‘getsubopt’

and program segfaults when run it.

do have:

#define _xopen_source 500 #include <stdlib.h>

at top of file contains call subopt? error getting expect if call function has not been declared.


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