gcc path not found

You haven't provided enough details on your problem. I assume you are trying to build software for nios2 using the command line. You need to start the nios II command shell as shown in my previous post. Because this is a cross compiler, you don't use ordinary gcc, your commands for building all start with nios2-elf. For example nios2-elf-gcc, nios2-elf-ld, etc. There are plenty of tutorials on the Altera web site. Make sure you read the Nios2 EDS developers guide. I think chapter 4 has command line information.