[igraph] about globle variables

[qingchuan sun]

i know it is not a good idea to use names such as time and count for
globle variables. But i use it, and a strange thing happend. The code
is list here

#include <stdio.h>
#include <igraph.h>
FILE *time, *count;
igraph_t G;
main()
{
    ...
    igraph_watts_strogatz_game(&G,1,10000,3,0.4);
    ...
}

It can be compiled well. But when run it, the problem of segment fault
occure. If we delete the line "FILE ..." , and compile it, then it can
work well.

i want to know, what is the problem with it.
the version of the igraph i use is 0.5.2