Assuming you installed it to C:\devkitpro, make sure you set
the DEVKITARM environment variable to /c/devkitPro/devkitARM :
export DEVKITARM=/c/devkitPro/devkitARM
+Also, add its bin to your PATH:
+export PATH=$PATH:$DEVKITARM/bin
6 - Install Strawberry Perl [6]