Build failing due to libz version mismatch

[positive attitude]

Any idea why this is failing? Seems like I have wrong version of libz
but I followed the process of setting up the machine:

$ make
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=2.3.1
TARGET_PRODUCT=generic
TARGET_BUILD_VARIANT=eng
TARGET_SIMULATOR=false
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=GRH78
============================================
find: `frameworks/base/frameworks/base/docs/html': No such file or
directory
find: `out/target/common/docs/gen': No such file or directory
find: `frameworks/base/frameworks/base/docs/html': No such file or
directory
find: `out/target/common/docs/gen': No such file or directory
find: `frameworks/base/frameworks/base/docs/html': No such file or
directory
find: `out/target/common/docs/gen': No such file or directory
find: `frameworks/base/frameworks/base/docs/html': No such file or
directory
find: `out/target/common/docs/gen': No such file or directory
find: `frameworks/base/frameworks/base/docs/html': No such file or
directory
find: `out/target/common/docs/gen': No such file or directory
host Executable: aapt (out/host/linux-x86/obj/EXECUTABLES/
aapt_intermediates/aapt)
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/
4.4.3/../../../libz.so when searching for -lz
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/
4.4.3/../../../libz.a when searching for -lz
/usr/bin/ld: skipping incompatible /usr/lib/libz.so when searching for
-lz
/usr/bin/ld: skipping incompatible /usr/lib/libz.a when searching for -
lz
/usr/bin/ld: cannot find -lz
collect2: ld returned 1 exit status
make: *** [out/host/linux-x86/obj/EXECUTABLES/aapt_intermediates/aapt]
Error 1

Here is my ubuntu version:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.04
DISTRIB_CODENAME=lucid
DISTRIB_DESCRIPTION="Ubuntu 10.04.1 LTS"

Thanks

[Jean-Baptiste Queru]

My best guess is that you need to install a 32-bit version of that
library in order to build the 32-bit binaries that are used by the
Android build system. 64-bit systems don't typically come with those.

JBQ

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Software Engineer, Android Open-Source Project, Google.

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[positive attitude]

Thank JBQ!
From your reply, I got hint that there could be something wrong with
the configuration for either the build environment or the machine.
After running "uname -m" to get the machine architecture, I got
"x86_64". Seems Windows installer for Ubuntu installed 64 bit version
on 32 bit machine.
The I installed additional tools needed for 64 bit version and
initiated the make again.
Seems the issue for libz is gone.

Thanks for your help!