error compiling when combining projects

I have 2 separate working projects on a raspberry running raspbian. i am having some problems when joining them together and as i am not that good with the compiler itself(still learning) i don’t know how to work it out.

Error (finish_with_error can be ignored):

In file included from main.c:20:0:
/usr/local/include/wiringPi.h:216:21: error: conflicting types for ‘bcm2835_delayMicroseconds’
bcm2835.h:912:17: note: previous declaration of ‘bcm2835_delayMicroseconds’ was here
main.c:200:6: warning: conflicting types for ‘finish_with_error’ [enabled by default]
main.c:124:33: note: previous implicit declaration of ‘finish_with_error’ was here

The command i am using to compile is:

 gcc config.c rfid.c rc522.c main.c -o rc522_reader -lbcm2835 -lwiringPi -lwiringPiDev `mysql_config --cflags --libs`

Bcm2835.h(line 912):

extern void bcm2835_delayMicroseconds (uint64_t micros);

wiringPi.h(line 216):

extern void         delayMicroseconds (unsigned int howLong) ;

The problem is that i cant see where i there is two declarations the same way, these are libraries so i would prefer not to modify to avoid malfunctioning on the libs, is there something i can do to tell the compiler what to do?


Source: gcc

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