i am reporting problems in compression library installation, the msg recieved is as follows

linux-to7r:/home/regcm/intelsoft/src # cd zlib-1.2.7
linux-to7r:/home/regcm/intelsoft/src/zlib-1.2.7 # LDSHARED="icc -shared -Wl,-soname \
> -Wl,libz.so.1,--version-script,zlib.map" \
> ./configure --prefix=$INTELROOT
Checking for shared library support...
No shared library support; try without defining CC and CFLAGS
Building static library libz.a version 1.2.7 with icc.
Checking for off64_t... No.
Checking for fseeko... No.
Checking for strerror... No.
Checking for unistd.h... No.
Checking for stdarg.h... No.
Checking whether to use vs[n]printf() or s[n]printf()... using s[n]printf().
Checking for snprintf() in stdio.h... No.
  WARNING: snprintf() not found, falling back to sprintf(). zlib
  can build but will be open to possible buffer-overflow security
  vulnerabilities.
Checking for return value of sprintf()... No.
  WARNING: apparently sprintf() does not return a value. zlib
  can build but will be open to possible string-format security
  vulnerabilities.
Looking for a four-byte integer type... Not found.
linux-to7r:/home/regcm/intelsoft/src/zlib-1.2.7 #

Prior when i didn't defined CC and FLAGS it installed smoothly. For now its showing error.Do any body have idea and how can i get out of it.Need your view.

Regards

Muslim