17.2.1 The _CF_DIR_ m4 Macro
It can be advantageous to maintain all the files that make up your local m4 configuration
separately from the sendmail distribution. This prevents new releases of sendmail
from clobbering your source files. It also allows you to maintain configuration
information more conveniently (perhaps under rcs(1) control) and to use programs
such as make(1) to simplify configuration and installation.
* This is not the same Build script that is documented in ?§10.1 on page 346. It is a small shell script that works
only in the cf/cf directory and can be used only to build configuration files. You can use make in its place,
but make will not automatically find the correct version of m4 for you.
?? This is actually a good idea. It prevents new sendmail distributions from clobbering your .mc files.
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17.2 Configure with m4 | 589
Most modern versions of m4 allow you to define m4 macros on the command line,
and one such m4 macro is recognized internally by the m4 technique:
_CF_DIR_
This command-line m4 macro tells m4 where the m4/cf.m4 file described earlier is
located. It needs to have its value set to be the cf directory under the sendmail source
distribution, and it needs to end in a slashch aracter.
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