同样的程序在7.0版本上没问题

但在6.1的版本上出现下列问题

**** Build of configuration Debug for project softwarezs ****

make -s all
Compiling hello_led.c...
Linking softwarezs.elf...
/cygdrive/c/altera/61/nios2eds/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/lib/libc.a(closer.o)(.text+0x18): In function `_close_r':
/build/nios2/bin/nios2-gnutools/src/newlib/newlib/libc/reent/closer.c:53: warning: warning: close is not implemented and will always fail
/cygdrive/c/altera/61/nios2eds/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/lib/libc.a(lseekr.o)(.text+0x20): In function `_lseek_r':
/build/nios2/bin/nios2-gnutools/src/newlib/newlib/libc/reent/lseekr.c:58: warning: warning: lseek is not implemented and will always fail
Info: (softwarezs.elf) 44 KBytes program size (code + initialized data).
Info:                  8189 KBytes free for stack + heap.
Post-processing to create epcs_controller_boot_rom.flash
Post-processing to create cfi_flash.flash
Hardware simulation is not enabled for the target SOPC Builder system. Skipping creation of hardware simulation model contents and simulation symbol files. (Note: This does not affect the instruction set simulator.)
Build completed in 7.907 seconds

出现问题后把6.1的repare了一次，还是这样

请问高手怎么解决？

你的7.0要卸载干净再装6.1，高版本的程序低版本用本来就有可能有问题。

你按照提示warning: close is not implemented and will always fail
 lseek is not implemented and will always fail
把这两个函数修改一下，再试试。