求助本人刚开始学习单片机，做实验出现如下情况

Debug build of project `F:MYPICff.mcp' started.
Language tool versions: MPASMWIN.exe v5.51, mplink.exe v4.49, mplib.exe v4.49
Preprocessor symbol `__DEBUG' is defined.
Mon Jul 24 17:16:55 2017
----------------------------------------------------------------------
Clean: Deleting intermediary and output files.
Clean: Deleted file "F:MYPICff.mcs".
Clean: Done.
Executing: "C:Program Files (x86)MicrochipMPASM SuiteMPASMWIN.exe" /q /p16F877A "ff.asm" /l"ff.lst" /e"ff.err" /d__DEBUG=1
Error[105]   F:MYPICFF.ASM 2 : Cannot open file (Include File "PIC16F877A.INC" not found)
Error[113]   F:MYPICFF.ASM 5 : Symbol not previously defined (STATUS)
Error[113]   F:MYPICFF.ASM 6 : Symbol not previously defined (TRISD)
Error[113]   F:MYPICFF.ASM 7 : Symbol not previously defined (STATUS)
Error[113]   F:MYPICFF.ASM 8 : Symbol not previously defined (PORTD)
Error[113]   F:MYPICFF.ASM 9 : Symbol not previously defined (PORTD)
Error[113]   F:MYPICFF.ASM 10 : Symbol not previously defined (PORTD)
Halting build on first failure as requested.
----------------------------------------------------------------------
Debug build of project `F:MYPICff.mcp' failed.
Language tool versions: MPASMWIN.exe v5.51, mplink.exe v4.49, mplib.exe v4.49
Preprocessor symbol `__DEBUG' is defined.
Mon Jul 24 17:17:03 2017
----------------------------------------------------------------------
BUILD FAILED
请大神看看怎么回事？

Error[105]   F:MYPICFF.ASM 2 : Cannot open file (Include File "PIC16F877A.INC" not found)
这个文件没找到，先把这个解决了吧，通常都会有一些连带错误，比如一个文件没找到，与该文件相关的就都会报错了 。

好多人都在用的编译环境，不会出现这种差头文件的情况的，你是不是建项目时属性没选对？头文件包含先试试