Hi ebresie,
I have followed your suggestion but it still failed even reinstall the suite.
I have done the following,
1) Uninstall Palm OS Development Suite
2) Install Garnet OS Development Suite
3) Put Palm SDK 5.6 to the default PalmDev (C

rogram FilesACCESSGarnet OS Development Suite)
4)Run palmdev-prep successfully
C

almOSCygwinbin>palmdev-prep.exe --default sdk-56
Checking SDKs in /PalmDev
sdk-56 headers in 'Incs', no libraries
sdk-5r4 headers in 'include', libraries in 'lib'
Writing SDK details to configuration files...
...done
6) Import my project
5) But I still got error when compile
m68k-palmos-gcc -c -D__PALMOS__=0x05000000 -I/PalmDev/palmOne_SDK_50 -I"C:/Program Files/ACCESS/Garnet OS Development Suite/PalmOSTools/include/stlport" -O0 -g -fexceptions -UNDEBUG -Wall -palmos5r4 -o src/AppMain.o ../src/AppMain.c
Do you have any idea?
Thanks