[Cross Compile] Compiler error reporting is too harsh for ./configure (perhaps remove -Werror)

Q :
Error Message :
Compiler error reporting is too harsh for ./configure (perhaps remove -Werror).

A :
When I meet this question, I find out the problem is my script. (check configure.log)
I use following script to configure zlib.
CC=armeb-unknow-gcc <- but no this compiler in my environment

I check my environment just have armeb-root-linux-uclibcgnueabi-gcc
So I modify CC=armeb-root-linux-uclibcgnueabi-gcc, then compile pass.