Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
checking for wsman_create_doc() in -lwsman... no
Cannot find wsman_create_doc() in libwsman
Is openwsman-devel installed ?
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.
It shows more detailed info about build failure.