https://gist.githubusercontent.com/hessch/5383798/raw/e8d099...
For speed, you might be able to compile it with awka and any C compiler with the math library:
https://github.com/noyesno/awka
awka -f mandelbrot.awk > mandelbrot.c cc -O2 -lawka -lm -o mandelbrot mandelbrot.c
https://gist.githubusercontent.com/hessch/5383798/raw/e8d099...
For speed, you might be able to compile it with awka and any C compiler with the math library:
https://github.com/noyesno/awka