Help needed configuring postgreSQL with xml support

I am getting following error in configuration.log of installation . Please help

Is there any pkg-config path that needs to be configured/set in environment for this to work.

configure:8172: checking for libxml-2.0 >= 2.6.23
configure:8179: $PKG_CONFIG --exists --print-errors "libxml-2.0 >= 2.6.23"
Package libxml-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `libxml-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libxml-2.0' found
configure:8182: $? = 1
configure:8196: $PKG_CONFIG --exists --print-errors "libxml-2.0 >= 2.6.23"
Package libxml-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `libxml-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libxml-2.0' found
configure:8199: $? = 1
configure:8213: result: no
No package 'libxml-2.0' found

I later tried setting the some environment variables like

export XML2_CFLAGS='/usr/lib64/'
export XML2_CONFIG='/usr/lib64/'
export XML2_LIBS='/usr/lib64/libxml2

Created soft link as well libxml2.so -> /usr/lib64/libxml2.so.2.9.1 but now I getting the below error .

configure: error: header file <libxml/parser.h> is required for XML support

From config.log

configure:13266: checking libxml/parser.h usability
configure:13266: gcc -std=gnu99 -c -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Werror=vla -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fexcess-precision=standard -O2 -D_GNU_SOURCE conftest.c >&5
conftest.c:96:27: fatal error: libxml/parser.h: No such file or directory
#include <libxml/parser.h>
^
compilation terminated.
configure:13266: $? = 1
configure: failed program was:

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