Wireshark · Wireshark-dev: [Wireshark-dev] how to modify the source code?

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I want a add a file peformance.h in wireshark,in the file i define a struct ,below is the content of the file

#include <glib.h>

typedef struct peformance_s

{

gfloat time[100];

      gfloat delay[100];

guint32 packetSize[100];

guint32 payload;

guint32 index;

guint32 temp_size;

gfloat temp_time;

}peformance;

extern peformance* peformance_test;

the i add the head file in the .c file ,use it like this :

 peformance_test->index=0;

it occurs to me the error:

 expected ??=??, ??,??, ??;??, ??asm?? or ??__attribute__?? before ??->?? token