Having trouble building

I followed Doctor Nick's guide, but there's an error when I type make.

make -C graphics/text
make[1]: Entering directory '/drives/c/games/doom/freedoom/graphics/text'
./textgen
make[1]: *** [Makefile:71: graphics.stamp] Error 127
make[1]: Leaving directory '/drives/c/games/doom/freedoom/graphics/text'
make: *** [Makefile:45: subdirs] Error 2

Hm, do you have imagemagick installed?

Is the textgen script marked as executable?