Seemingly Simple Header File Problem

hello all,

   i've been running against seems simple, isn't working.  have main file (which includes wire.h), , header file of creation associated .c file.  functions in .c file can't see functions wire.h, else seems link fine (i.e. functions primary .ino file).  there obvious i'm missing?  i've tried silly stuff reordering include statements , including .c file directly, no joy.  i'm using platformio , can't tell if problems stems c problem, or else.  looking!

here's code gaze at:

primary.ino
***********

code: [select]


#include <wire.h>
#include <liquidcrystal_i2c.h>
#include <math.h>
#include "bwgi2c.h"  //this creation


bwgi2c.h
***********

code: [select]


#ifndef bwgi2c_h_   /* include guard */
#define bwgi2c_h_

int scan(void);
int verifyfreeaddress(int address); 

#endif // bwgi2c_h_


bwgi2c.c
***********

code: [select]


// long post in it's entirety, here's sample
int scan(void)
{     
    int error, address;

    wire.begin();  //this compiler says wire undefined
<snip>
}


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the wire library c++. try changing filename of bwgi2c.c bwgi2c.cpp.

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