Weird Error Trying to install Summarize

[ddavisgraphics]

2 warnings generated.
compiling dictionary.c
dictionary.c:28:10: fatal error: 'libxml/xmlmemory.h' file not found
#include <libxml/xmlmemory.h>
         ^~~~~~~~~~~~~~~~~~~~
1 error generated.
make: *** [dictionary.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/djdavis/.rvm/gems/ruby-2.6.3/gems/summarize-1.0.3 for inspection.
Results logged to /Users/djdavis/.rvm/gems/ruby-2.6.3/extensions/x86_64-darwin-18/2.6.0/summarize-1.0.3/gem_make.out```

[ddavisgraphics]

I have verified the LibXML2 is installed.

[rshetye]

You need the dev version of libxml2 e.g. libxml2-dev on ubuntu