I can not run make-kpkg

in amd64

make-kpkg configure --config menuconfig
exec debian/rules DEBIAN_REVISION=2.6.27.7-10.00.Custom CONFIG_TARGET=menuconfig configure
[: 1: 2: unexpected operator
[: 1: 2: unexpected operator
[: 1: 3: unexpected operator
[: 1: 2: unexpected operator
[: 1: 2: unexpected operator
[: 1: 2: unexpected operator
[: 1: 2: unexpected operator
[: 1: 2: unexpected operator

====== making target CONFIG-common [new prereqs: testdir]======

====== making target CONFIG-common [new prereqs: stamp-conf]======
This is kernel package version 11.001-0.1.
====== making stamp-arch-conf because of ======

====== making target CONFIG-arch [new prereqs: stamp-arch-conf]======
====== making target conf.vars [new prereqs: Makefile .config]======

Makefile:528: /usr/src/linux-source-2.6.27/arch/xen/Makefile: Nessun file o directory
make[1]: *** No rule to make target `/usr/src/linux-source-2.6.27/arch/xen/Makefile'. Stop.
make: *** [conf.vars] Error 2