Hi - I am following this tutorial and getting this error.
This exact question was asked; however, I do have the mkdir file in the C:\Program Files (x86)\GNU ARM Eclipse\Build Tools\2.8-201611221915\bin folder.
My makefile.windows looks like this:
..and my PATH in my env. variables is this: C:\Program Files (x86)\GNU Tools ARM Embedded\6.2 2016q4\bin;C:\Program Files (x86)\GnuWin32\bin.
Thanks in advance! D.K.