thanks for the message - the makefile of the Raspberry Pi Build Environment was not up to date.
The following path settings have to be adapted, so that they match to the directory structure:
BUILD_PATH = ../Build
EMWI_APP_PATH = ./GeneratedCode
EMWI_RTE_PATH = ../PlatformPackage/RTE
EMWI_GFX_PATH = ../PlatformPackage/RGBA8888
OBJ_PATH = ./obj
BIN_PATH = .
You can either edit your makefile - or you can download again the entire package. There is also a new sample added.
Hope this helps...