[U-Boot] Compiler error with BUILD_DIR

Hello, I'am getting an compiler error if I use a seperate BUILD_DIR: /home/gl/swserver/work/LINUX/ELINOS_PROJECTS/ELINOS_50/demoF302P/src/u-boot/build/tools/fdt.c:81: error: conflicting types for âfdt_offset_ptrâ /usr/include/../include/libfdt.h:125: error: previous declaration of âfdt_offset_ptrâ was here because I have installed a different version of the dtc.

If I build u-boot without a seperate BUILD_DIR, I get no error.

I'am using u-boot-2009.03.

Thanks for any help Günter