为何出现下面情况？

aben

马老师：

我在实验板中试用《1602b液晶使用范例〉出现下面的提示：请帮忙解答。谢谢！

Compiling: lcd.c

avr-gcc -c -mmcu=atmega16 -I. -gdwarf-2 -DF_CPU=1000000UL  -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes -Wa,-adhlns=lcd.lst  -std=gnu99 -MD -MP -MF .dep/lcd.o.d lcd.c -o lcd.o

lcd.c:1:19: iom16.h: No such file or directory

lcd.c:2:20: macros.h: No such file or directory

lcd.c: In function `LCD_en_write':

lcd.c:50: error: `PORTC' undeclared (first use in this function)

lcd.c:50: error: (Each undeclared identifier is reported only once

lcd.c:50: error: for each function it appears in.)

lcd.c: In function `LCD_write_char':

lcd.c:62: error: `PORTC' undeclared (first use in this function)

lcd.c:63: error: `PORTA' undeclared (first use in this function)

lcd.c: At top level:

lcd.c:84: warning: return type of 'main' is not `int'

lcd.c: In function `main':

lcd.c:85: error: `DDRA' undeclared (first use in this function)

lcd.c:86: error: `DDRC' undeclared (first use in this function)

make.exe: *** [lcd.o] Error 1

aben

马老师：这个我一弄明白了，谢谢！