 | Chapter 2 Have a V8 |  |
| Chapter 2 Have a V8 | |
Now that you have the distribution and have changed into the
src directory, you will find a script called
makesendmail. For nearly all systems, all you have to
do is run that script to build sendmail.
To determine whether your system is supported, run the makesendmail
script now, with the -m command-line switch:
%./makesendmail -mConfiguration: os=SunOS, rel=4.1.4, rbase=4, arch=sun4, sfx=Will run in virgin obj.SunOS.4.1.4.sun4 using Makefile.SunOS%
Here, makesendmail indicates that it knows how to build a sendmail for SunOS 4.1.4. It will use the Makefile called Makefile.SunOS. If it is unable to determine a Makefile, it will print a message like this and exit:
Cannot determine how to supportarch.os.rel
Here, arch is the generic type of machine, such as sun4 or 9000/720. The os is the operating system type, such as SunOS or HP-UX. And the rel is the version of the operating system, such as A or 4.1.3. If your system is not supported, you are going to have to do a port (ugh!). Read the READ_ME file, and skip ahead to Chapter 18, Compile and Install sendmail.
Fortunately makesendmail succeeded in this example, and, because we are running on a Sun system with SunOS 4.1.4, makesendmail selected Makefile.SunOS as the Makefile that we will be using. Had we been running on something else, for example, say an SGI machine, it might have selected a different Makefile, such as Makefile.IRIX. All the Makefile files are located under src in a subdirectory called Makefiles. That subdirectory should look something like this:
Makefile.386BSD Makefile.ISC Makefile.Solaris Makefile.A-UX Makefile.KSR Makefile.SunOS Makefile.AIX Makefile.LUNA Makefile.SunOS.4.0 Makefile.Altos Makefile.Linux Makefile.SunOS.5.1 Makefile.BSD-OS Makefile.Mach386 Makefile.SunOS.5.2 Makefile.BSD43 Makefile.NCR3000 Makefile.SunOS.5.3 Makefile.CLIX Makefile.NEWS-OS.4.x Makefile.SunOS.5.4 Makefile.CSOS Makefile.NEWS-OS.6.x Makefile.SunOS.5.5 Makefile.ConvexOS Makefile.NEXTSTEP Makefile.Titan Makefile.Dell Makefile.NeXT Makefile.ULTRIX Makefile.DomainOS Makefile.NetBSD Makefile.UMAX Makefile.Dynix Makefile.NonStop-UX Makefile.UNICOS Makefile.EWS-UX_V Makefile.OSF1 Makefile.UNIX_SV.4.x.i386 Makefile.FreeBSD Makefile.PTX Makefile.UX4800 Makefile.HP-UX Makefile.Paragon Makefile.UXPDS Makefile.HP-UX.10.x Makefile.RISCos Makefile.Utah Makefile.IRIX Makefile.SCO Makefile.dgux Makefile.IRIX.5.x Makefile.SCO.3.2v4.2 Makefile.dist Makefile.IRIX64 Makefile.SVR4 Makefile.uts.systemV
Since we have thus far been successful, you can now go ahead and run makesendmail for real. Be prepared to interrupt it with a control-C, because we will need to tune your Makefile after it has been copied:
%./makesendmailConfiguration: os=SunOS, rel=4.1.4, rbase=4, arch=sun4, sfx= Creating obj.SunOS.4.1.4.sun4 using Makefile.SunOS Making dependencies in obj.SunOS.4.1.4.sun4 Making in obj.SunOS.4.1.4.sun4 cc -I. -O -I/usr/sww/include -DNDBM -DNEWDB -DNIS -target sun4 -c alias.c^C
The makesendmail script first creates a directory in which you will eventually build sendmail. It then (invisibly) creates links inside that directory to all the source files and to an appropriate Makefile. Finally, it starts to build sendmail. You interrupt the build with a control-C just after the first compiler line of output. From this point forward we will work inside that new directory, so cd into it:
%cd obj.SunOS.4.1.4.sun4
As distributed, your newly created Makefile is not writable. But we may need to modify it, so we need to make it writable:
%chmod u+w Makefile
There are three important reasons to modify your default Makefile. If you don't have the Berkeley db(3) library, you need to remove db support from your Makefile. If you are not connected to the Internet and are not running a named(8) name server, you need to eliminate DNS support from your Makefile. Finally, you need to read the comments inside your Makefile and make any changes suggested there.
If you have not installed the Berkeley db(8) library package, or
do not know whether you have, you need to remove support for that
package from your Makefile.
Edit your Makefile and look for the line that begins
with the word DBMDEF:
DBMDEF= -DNDBM -DNEWDB -DNISthis line
delete this from the line
Delete the string -DNEWDB from the DBMDEF line to form
the following:
DBMDEF= -DNDBM -DNIS
Next search for the line that begins with LIBS:
LIBS= -ldb -ldbm -lresolv
Delete the string -ldb from the LIBS= line to form the
following:
LIBS= -ldbm -lresolv
This completes the removal of Berkeley db(3) support from your Makefile.
If your site does support the Berkeley db(3) library package, you
may still need to massage your Makefile. To include this support
inside sendmail, you need to specify the correct include files
and library path. Search for the line that begins with INCDIRS:
INCDIRS=-I/usr/sww/include
You need to change both lines to contain the correct paths where you installed the Berkeley db(3) library. If you aren't sure about any of this information, you should eliminate support instead.
INCDIRS=-I/usr/local/include/dblocal/lib
As shown in the two preceding examples, we installed the Berkeley db(3) include files in /usr/local/include/db and the library in /usr/local/lib.
If you are on a machine that does not support DNS (such as a home workstation that connects to the outside world exclusively via UUCP), you will need to exclude DNS support from sendmail. One way to tell whether your machine supports DNS is to run the nslookup(8) program. It may not be in your path, so if it is not found when you try to run it, you have to find it. Try looking in /usr/etc or /usr/sbin. If nslookup(8) hangs when you run it, your system probably does not support DNS. If it doesn't hang, its output will look like this. Just type Control-D to exit:
%/usr/etc/nslookupDefault Server: localhostAddress: 127.0.0.1>^D
If your system lacks DNS support, you must then redefine the value of
NAMED_BIND as 0 in Makefile. One way to do that is to
edit your Makefile and search for the line beginning
with the string ENVDEF:
ENVDEF=
Append to that line the following string, which turns off DNS support inside sendmail:
ENVDEF=-DNAMED_BIND=0
Independent of support for db(3) and DNS, your operating system may impose its own requirements. To discover whether it does and what they might be, edit your Makefile, and look through it for operating-system-specific comments. A sampling of the many such comments might look like this:
# you can use -O3 on AIX 3.2.4 or greater ONLY!
No matter which Makefile is yours, all customizing should be done before this line:
################### end of user configuration flags ######################
Unless you are an expert at compiling Makefiles, avoid changing anything after this line. You risk "breaking" your Makefile and ruining your ability to build.
|  | |
| 2.3 What's What in src |  | 2.5 Build |