Build Make Target

I want to do "build make target " of sample/hello ,but there is an error!

hello.gdb can't be created!and list are the messages.

make -k all

no emulation specific options.

nios2-elf-gcc -nostdinc -D__linux__ -O0 -g -I"d:/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.uClibc_1.4.0"/include -I/cygdrive/d/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1//include -fno-optimize-sibling-calls -mhw-mul -mhw-mulx -Wall -c -o hello.o hello.c

nios2-elf-gcc -msys-crt0="d:/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.uClibc_1.4.0"/lib/crt0.o -r -d -L"d:/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.uClibc_1.4.0"/lib -o hello.bin hello.o /cygdrive/d/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/../../../../nios2-elf/lib/libm.a /cygdrive/d/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/gcc/nios2-elf/3.4.1/libgcc.a "d:/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.uClibc_1.4.0"/lib/libc.a

nios2-elf-ld -T "d:/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.application_1.4.0"/scripts/elf2flt.ld -o hello.gdb hello.bin

nios2-elf-ld: cannot open output file hello.gdb: Permission denied

make: *** [hello.gdb] Error 1

make: Target `all' not remade because of errors.

I don't know why! who can help me!