TNAME"
>PostgreSQL</SPAN
> into shared installation locations
       (such as <TT
CLASS="FILENAME"
>/usr/local/include</TT
>) without
       interfering with the namespace of the rest of the system. First,
       the string <SPAN
CLASS="QUOTE"
>"<TT
CLASS="LITERAL"
>/postgresql</TT
>"</SPAN
> is
       automatically appended to <TT
CLASS="VARNAME"
>datadir</TT
>,
       <TT
CLASS="VARNAME"
>sysconfdir</TT
>, and <TT
CLASS="VARNAME"
>docdir</TT
>,
       unless the fully expanded directory name already conta