Category "xc8"

why does have in error in undefined symbols?

I'm trying to use a 4x4_keypad.h, LCD_16x2_4bit.h and osc_config.h to get my 4x4_keypad.c, Calculator.c and LCD_16x2_4bit.c cleaner and tidied up. But I get man

Compiler does not support 64-bit integers on target Architechture

I am new to MPLAB XC8 compiler and don't know why this error is happening as I did not use any number that is of 64 bit in my code. Code is as follow #include &