编译这样提示我：
“
**** Incremental build of configuration Debug for project hello_led_0 ****
make -s all
Compiling alt_alarm_start.c...
c:\altera\kits\nios2_60\bin\nios2-gnutools\H-i686-pc-cygwin\bin\nios2-elf-gcc.exe (1976): *** proc version mismatch detected - 0x8E0899FA/0x19C16FB6.
You have multiple copies of cygwin1.dll on your system.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.
make[1]: *** [obj/alt_alarm_start.o] Error 128
make: *** [system_project] Error 2
Build completed
”

我在我的系统中找到两个cygwin1.dll 文件，文件大小不一样，一个在C:\WINNT\system32下面，一个在C:\altera\quartus60\bin\cygwin\bin下面，我不管删除哪个或者是互相替换都不能解决问题，删除之后编译提示无法定位。请问为什么呢？