Please help me with this I am new to the openrisc. Right now I am working on DE0 Nano board. The link i was following is this https://github.com/juliusbaxter/mor1kx-dev-env/wiki/OpenRISC-SoC-on-FPGA. Here when I tried to check for the Accelerometer demo the following error occurred

(gdb) make simple_spi-adxl345.elf
/tmp/ccGShEhS.o: In function `main':
/home/bhanu/or1k/mor1kx-dev-env/boards/altera/de0_nano/sw/tests/simple_spi/board/simple_spi adxl345.c:290: undefined reference to `abort'
collect2: error: ld returned 1 exit status
make: *** [simple_spi-adxl345.elf] Error 1

Help me resolve this issue. I didn�t have much experience with Linux. So any small help would be appreciated thank you.