Exception in thread "main" java.lang.Error: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/include/libxml2/libxml/tree.h:17:10: fatal error: 'libxml/xmlversion.h' file not found

headers = libxml2/libxml/tree.h libxml2/libxml2/xpath.h libxml2/libxml/Htmlparser.h
compilerOpts.osx = -I/usr/include/libxml2
linkerOpts.osx = -lxml2