zlib를 arm-elf-gcc로 크로스컴파일 하는 중에 나온 에러의 이유유

[root@localhost zlib-1.2.5]# CC=arm-elf-gcc ./configure --prefix=/home/test/zlib
Checking for shared library support...
Tested arm-elf-gcc -w -c -O3 -fPIC ztest4402.c
Tested arm-elf-gcc -shared -Wl,-soname,libz.so.1,--version-script,zlib.map -O3 -fPIC -o ztest4402.so ztest4402.o
/usr/local/arm-elf/lib/crt0.o(.text+0x10): In function `_start':
: undefined reference to `__uClibc_main'
/usr/local/arm-elf/lib/crt0.o(.text+0x14): In function `_start':
: undefined reference to `abort'
ztest4402.o(.text+0xc): In function `hello':
: undefined reference to `getchar'
collect2: ld returned 1 exit status
No shared library support; try without defining CC and CFLAGS
Building static library libz.a version 1.2.5 with arm-elf-gcc.
Checking for off64_t... Yes.
Checking for fseeko... Yes.
Checking for unistd.h... Yes.
Checking whether to use vs[n]printf() or s[n]printf()... using vs[n]printf().
Checking for vsnprintf() in stdio.h... No.
  WARNING: vsnprintf() not found, falling back to vsprintf(). zlib
  can build but will be open to possible buffer-overflow security
  vulnerabilities.
Checking for return value of vsprintf()... Yes.
Checking for attribute(visibility) support... No.