2.4.0-prerelease-ac5 : 'make dep' error

Hello,
I received the following make dep error while compiling
prerelease-ac5 .
Regards,
Frank

make -C acpi fastdep
make[4]: Entering directory /usr/src/linux/drivers/acpi' /usr/src/linux/Rules.make:224: *** Recursive variable CFLAGS' references itself (eventually). Stop.
make[4]: Leaving directory `/usr/src/linux/drivers/acpi' make[3]: *** [_sfdep_acpi] Error 2
make[3]: Leaving directory `/usr/src/linux/drivers'
make[2]: *** [fastdep] Error 2
make[2]: Leaving directory `/usr/src/linux/drivers'
make[1]: *** [_sfdep_drivers] Error 2
make[1]: Leaving directory `/usr/src/linux'
make: *** [dep-files] Error 2

Which version of make are you running, make --version?

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