GRRLIB: powerpc-eabi-gcc: No such file or directory

i cloned the grrlib source code and entered the directory GRRLIB and ran make clean but when i run make all i get this

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pngu.c make[2]: powerpc-eabi-gcc: No such file or directory make[2]: *** [pngu.o] Error 1 make[1]: *** [all] Error 1 make: *** [all] Error 1 `