[guide] 5.3 missing keywords

[Bjarne D Mathiesen]

A description of the "build.dir" & "configure.dir" keywords are missing

I only discovered these keywords by accident by looking in a Portfile
for help with exactly these issues : changing into a directory before a
python install

Possible description :
build.dir
Changes into this directory before building. Default is ${worksrcpath}
Example :
    build.dir           ${worksrcpath}/${name}-apache

Possible description :
configure.dir
Changes into this directory before configuring. Default is ${worksrcpath}
Example :
    configure.dir           ${worksrcpath}/${name}-apache

-- 
Bjarne D Mathiesen
Korsør ; Danmark ; Europa
----------------------------------------------------------------------
denne besked er skrevet i et (næsten) M$-frit miljø
MacOS X 10.13.6 High Sierra :
   17" 2011 MacBook Pro ; 2.8GHz Intel Core i7 ; 16GB 1067MHz DDR3
   2012 Mac Pro ; 2 x 3.46GHz 6-Core Xeon ; 48GB
MacOS X 10.6.8 Snow Leopard :
   Mac Mini ; 2GHz Core 2 Duo (64 bit) ; 4GB (3GB actual) 667MHz
   Mac Mini ; 1.83GHz Core Duo (32 bit) ; 2GB 667Mhz