The first step in compiling sendmail is to establish an object directory and a Makefile that is appropriate to your machine architecture and operating system. You do this by running the Build script in the sendmail source directory: [3]
% cd sendmail % ./Build -n Configuration: pfx=, os=SunOS, rel=4.1.4, rbase=4, rroot=4.1, arch=sun4, sfx= Using M4=/usr/5bin/m4 Creating ../obj.SunOS.4.1.4.sun4/sendmail using ../devtools/OS/SunOS many more lines here % Here, Build found that our machine was a sun4 , running the SunOS 4.1.4 release of Unix. Build then created the working directory ../ obj.SunOS.4.1.4.sun4 , set up symbolic links to all the source files in that directory, and finally generated a Makefile there. The Build program understands several command-line switches that can be used to modify its behavior (see Table 2-2). Any switch or other command-line argument that is not in that table is carried through and passed as is to the make (1) program. For example, specifying the -n switch to Build (in the earlier example) caused Build to pass that switch to make (1), thereby preventing make (1) from actually building sendmail . Table 2-2. Build command-line switches
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