This is the file for the compilation process figure,
4-1 in More C have I got enough text yet asked Zippy,
Well, let's see.
Draw the picture now.
.PS
MC: box invisible "main.c"
    arrow
    box width 1i "preprocessor"
    arrow
    box "compiler"
    arrow
MO: box invisible "main.o"


    line invis down from bottom of MC
PC: box invisible "preblank.c"
    arrow right from PC.e
    box width 1i"preprocessor"
    arrow right
    box "compiler"
    arrow
PO: box invisible "preblank.o"
    arrow down right
LD: box ht 1i wid 1i "link editor" "(ld)"
    arrow
    box invis "a.out"
    arrow from MO.b to LD.w

    line invis down from bottom of PC
AC: box invisible "adjstring.c"
    arrow right from AC.e
    box width 1i "preprocessor"
    arrow
    box "compiler"
    arrow 
AO: box invisible "adjstring.o"
    arrow from right of AO to LD.w

    line invis down from bottom of AC
TC: box invisible "tblank.c"
    arrow right from TC.e
    box width 1i "preprocessor"
    arrow
    box "compiler"
    arrow
TO: box invisible "tblank.o"
    arrow from TO.t to LD.w
.PE

That's the picture.