Xml2 package installation issues - pkg-config PATH help

Hi rajeobi, welcome to community!

First, it's best practice to reproduce your error with as a reprex (If you're not familiar with that; REPRoducible EXample (reprex)).

Second, your error message provides advice to resolve the issue. What happens after you follow that lead?

Specifically, the message:

If libxml-2.0 is already installed, check that 'pkg-config' is in your PATH and PKG_CONFIG_PATH contains a libxml-2.0.pc file. If pkg-config is unavailable you can set INCLUDE_DIR and LIB_DIR manually via: R CMD INSTALL --configure-vars='INCLUDE_DIR=... LIB_DIR=...'

Next, if the issue presists,

Some system Information could be useful as well
#### System Information:
- RStudio Edition: (Desktop or Server)
- RStudio Version: 
- OS Version: 
- R Version: 

#### Also:
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- RStudio diagnostics report: <!--see rstd.io/support-diagnostics-report /-->
- Your `sessionInfo()`:
- RStudio crash report: <!-- rstd.io/support-crash-report /-->
- RStudio application log files: <!-- rstd.io/support-ide-log-files /-->
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