I have succesfully compiled with cygnus (GCC v3.2) When cygnus path is changed to: C:\winarm and change the GNU Tool prefix to "arm-elf-" Then build I get error: --- Error: can't execute 'arm-elf-as' I've read the tech/support notes; Does the path actually need to be; "C:\Program Files\GNUARM" as stated in the tech/support note. I wouldnt think so.