I found the problem, there was a non standard ASCII character in the include path.

Yes, i have the sam4e.h in my CoreNG\asf\sam\utils\cmsis\sam4e\include folder.
The directory is also listed in the includes of the CoreNG project.

Is there something else that could cause this problem?

Hello,

First i want to thank all the people that work on the Duet elctronics ant the RepRapFirmware for making such a great product.
I'm a mechatronics student from germany and want to help by adding features and improving the firmware.

I followed the buildinstructions from the github page. The only difference is, i have a newer version of the Arduino IDE, but that shouldn't be a problem.
I imported:
-CoreNG
-DuetWifiSoketServer
-RepRapFirmware
into eclipse and changed to path of the gcc cross compiler to the correct one.
The only problem i have now is that when i want to build CoreNG it tells me sam4e.h is missing.
Did i miss any include or something?

Thanks for any help.

[[language]]
16:06:06 **** Incremental Build of configuration SAM4E8E for project CoreNG ****
make all 
'Building file: ../variants/duetNG/exceptions.c'
'Invoking: Cross GCC Compiler'
arm-none-eabi-gcc -D__SAM4E8E__ -DUDD_ENABLE -DUDD_NO_SLEEP_MGR -I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\cores\arduino" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf" -I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\utils" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\utils\header_files" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\utils\preprocessor" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\utils\cmsis\sam4e\include" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\drivers" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\drivers\dmac" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\drivers\efc" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\drivers\hsmci" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\drivers\pio" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\drivers\pmc" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\drivers\spi" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\drivers\usart" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\common\utils" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\common\services\clock" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\common\services\ioport" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\common\services\sleepmgr" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\common\services\usb" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\common\services\usb\udc" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\common\services\usb\class\cdc" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\common\services\usb\class\cdc\device" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\thirdparty\CMSIS\Include" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\variants\duetNG" 
-I"C:\Users\*USER*\Documents\Workspace_duet\CoreNG\asf\sam\utils\cmsis\sam4e\include" 
-O2 -Wall -c -std=gnu99 -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -ffunction-sections -fdata-sections -nostdlib -MMD -MP 
-MF"variants/duetNG/exceptions.d" 
-MT"variants/duetNG/exceptions.o" 
-o "variants/duetNG/exceptions.o" 
"../variants/duetNG/exceptions.c"
In file included from ../variants/duetNG/exceptions.c:57:0:
../variants/duetNG/exceptions.h:50:19: fatal error: sam4e.h: No such file or directory
 #include "sam4e.h"
                   ^
compilation terminated.
make: *** [variants/duetNG/exceptions.o] Error 1