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when installing Postgres-9.0.1 on CentOS-5../configure -- output checking for inflate in -lz... no configure: error: zlib library not found

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When we are  installing Postgres-9.0.1 on CentOS-5. 
Below is the error we are encountering -
./configure -- output
checking for inflate in -lz... no
configure: error: zlib library not found

If you have zlib already installed, see config.log for details on the
failure.  It is possible the compiler isn't looking in the proper directory.
Use --without-zlib to disable zlib support.

Inside the config.log, below is what we see -
configure:8204: checking for inflate in -lz
configure:8239: gcc -o conftest -O2 -Wall -Wmissing-prototypes
-Wpointer-arith -Wdeclaration-after-statement -Wendif-labels
-fno-strict-aliasing -fwrapv  -D_GNU_SOURCE    conftest.c -lz  -lreadline
-ltermcap -lcrypt -ldl -lm  >&5
/usr/bin/ld: skipping incompatible /usr/lib/libz.a when searching for -lz
/usr/bin/ld: cannot find -lz

Zlib rpms are installed and below is the rpm -qa output -
[root(at)localhost postgresql-9.0.1]# rpm -qa | grep zlib
zlib-1.2.3-4.el5
jzlib-1.0.7-4jpp.1
zlib-devel-1.2.3-4.el5

zlib-1.2.3-3


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