J.4. Building the Documentation with Meson
  To build the documentation using Meson, change to the
  
   build
  
  directory before running one of these commands,
    or add
  
   -C build
  
  to the command.
 
To build just the HTML version of the documentation:
build$ninja html
  For a list of other documentation targets see
  
   Section 17.4.4.3
  
  .
    The output appears in the
    subdirectory
  
   build/doc/src/sgml
  
  .