04 December 1999    Luca Palmeri   lpalmeri@ux1.unipd.it
--------------------------------------------------------

<<< Compiling GRASS 5.0 beta5i on Digital Unix Alpha >>>

--------------------------------------------------------

+ Choosing the compiler:
  
  You can compile grass on DU alpha with gcc or with cc. The 
  latter is recomendend for code optimization on the 64 bit 
  pipes. 

  to force the use of the proper compiler:

   $  export  CC=cc ; ./configure \
                [ --prefix=myprefix --with-bin-dir=mybindir ]
        
	or
	
   $  export CC=gcc ; ./configure \
                [ --prefix=myprefix --with-bin-dir=mybindir ]


--------------------------------------------------------

+ Possible libraries problems 
    (to check after running ./configure):

  Check your alpha box and answer to the following:
  
   Do I have:
   
     curses or ncurses ?
       check in src/CMD/head/head
     
     libtiff, libjpg, zlib ?
       Yet ./configure do not recognize the absence of libtiff, 
       so if you do not have it installed you should comment 
       "r.tiff" in src/list/GRASS 

     lex or/and flex ?
       see patches 2), 3) and 4) below.
     
  
-------------------------------------------------------

+ Usefull patches:
  
  1) g.help - < g.help_patch > problem with curses
     may be usefull if you have old "curses" in place of "ncurses"
  
  2) r.combine - < r.combine_patch > problems with flex's yywrap

  3) r.mapcalc - < r.mapcalc_patch >  " "      "    "       "

  4) r.weight - < r.weight_patch >    " "      "    "       "
  
  Patches 2), 3) and 4) are usefull with cc if you have lex but
  not flex

--------------------------------------------------------------

+ Do not compile on DU (with DU cc compiler):

  1) i.points3  should be commented in src/list/GRASS

  2) i.tape.tm3 should be commented in src/list/GRASS
  
  3) r.statistics should be commented in src/list/GRASS
   
  

--------------------------------------------------------------

+ Some notes about GRASS on 64bit machines:

Even if working perfectly, there are some compatibility
problems with the portable vector format (PVF). Vector
files generated on 32bit machines cannot be read by 64bit
machines and viceversa (the grass development team is working
on this and is planned a future release that will be totally 
64/32bit independent). For this reason the default mapset 
"spearfish" is not fully working on the alpha.
To find more info about this problem and 64bit mapsets go to 
Bill Hughes page at:
    http://grasshopper.grasshoppernet.com/~bhughes/
    
For the moment being a walkaround exists for passing vector
files between 64 and 32 bit machines: you can do that by exporting
the vector file to ascii (v.out.ascii) copy the ascii files on
the other machine and then importing it (v.in.ascii).


A prototype of this library you find in src/libes/vect32_64/