请教:6.7. Linux-2.6.27.4 API Headers出错了！

作者: greatsnows

chroot之后的制作header出错：
root:/sources/linux-2.6.27.4# make mrproper
CLEAN include/linux/version.h
root:/sources/linux-2.6.27.4# make headers_check
CHK include/linux/version.h
UPD include/linux/version.h
HOSTCC scripts/basic/fixdep
/tools/libexec/gcc/i686-pc-linux-gnu/4.3.2/cc1: error while loading shared libraries: libmpfr.so.1: cannot open shared object file: No such file or directory
make[1]: *** [scripts/basic/fixdep] Error 1
make: *** [scripts_basic] Error 2
root:/sources/linux-2.6.27.4#


请教“/tools/libexec/gcc/i686-pc-linux-gnu/4.3.2/cc1“这个变量不存在，怎么修改阿？