Documented mailutils-config.

@@ -18,6 +18,7 @@ GNU Mailutils provides a set of programs for handling the email.
 * sieve::         Mail filtering utility.
 * guimb::         Mailbox scanning and processing language.
 * comsatd::       Comsat daemon.
+* mailutils-config:: Get the information about the mailutils build.
 @end menu
 
 @page
@@ -3040,3 +3041,205 @@ $B(,5)\
 ---\n"
 @end group
 @end example
+
+@page
+@node mailutils-config
+@section mailutils-config --- Get the information about the mailutils build.
+@pindex mailutils-config
+
+This program is designed for developers wishing to link their programs
+against libmailbox. It allows to examine the particulars of the
+current build of mailutils and to get the command line parameters
+necessary for compiling and linking an application with mailutils
+libraries.
+
+@menu
+* Compiler Flags::      Getting Compiler Flags.
+* Loader Flags::        Getting Loader Flags.
+* General Information:: Obtaining General Build Information.
+@end menu
+
+@node Compiler Flags
+@subsection Getting Compiler Flags.
+
+When invoked with the option @option{--compile}, or its short form
+@option{-c}, @command{mailutils-config} prints the flags
+that must be given to the compiler for compiling the program using
+mailutils functions. An example usage:
+
+@example
+cc -omyprog.o `mailutils-config --compile` myprog.c
+@end example               
+
+@node Loader Flags
+@subsection Getting Loader Flags
+
+The @option{--link}, or its short form @option{-l} prints to the
+standard output the loader flags necessary to link a program against
+mailutils libraries.
+
+When invoked without arguments, it produces the flags necessary to
+link against the basic library of mailutils: @file{libmailbox}.
+Up to two arguments may be given that alter this behavior. These
+are:
+
+@table @samp
+@item auth
+Print flags to link against @file{libmuauth}, the library adding new
+authentication methods to @file{libmailbox}.
+
+@item guile
+Print flags to link against @file{libmu_scm}, the Guile interface
+library. 
+@end table
+
+Both arguments may be given simultaneously, e.g.:
+
+@example
+cc -omyprog myprog.o `mailutils-config --link auth guile`
+@end example
+
+@node General Information
+@subsection Obtaining General Build Information
+
+The @option{--info}, or @option{-i} retrieves the options (flags) used
+when building mailutils. It may be used with or without
+arguments.
+
+When used without arguments, it prints the list of all
+build flags, e.g.:
+
+@example
+$ mailutils-config --info
+VERSION=0.1.3
+USE_LIBPAM
+HAVE_LIBLTDL
+WITH_GUILE
+WITH_READLINE
+HAVE_MYSQL
+ENABLE_VIRTUAL_DOMAINS
+ENABLE_IMAP
+ENABLE_POP
+ENABLE_MH
+ENABLE_SMTP
+ENABLE_SENDMAIL
+@end example
+
+This option also accepts any number of arguments. When these are
+given, each argument is treated as a name of a build flag. 
+@command{Mailutils-config} checks if such a flag was defined and
+prints its full name if so. It exits with zero code if all the
+flags given on the command line are defined. Otherwise, it
+exits with code of 1.
+
+The comparison of the flag names is case-insensitive. The arguments
+given need not include the leading prefix (i.e. the characters up
+to and including the first underscore character).
+
+Given the previous example, the invocation
+
+@example
+$ mailutils --info readline use_libpam pop
+@end example
+
+@noindent
+will produce the following output:
+
+@example
+WITH_READLINE
+USE_LIBPAM
+ENABLE_POP
+@end example
+
+@noindent
+and will exit with a zero status.
+
+The following command:
+
+@example
+$ mailutils --info readline gssapi pop
+@end example
+
+@noindent
+will exit with status 1, and will print:
+
+@example
+WITH_READLINE
+ENABLE_POP
+@end example
+
+@noindent
+since @code{WITH_GSSAPI} flag is not defined.
+
+The flags and their meanings are:
+
+@table @asis
+@c @item VERSION=" VERSION,
+@item USE_LIBPAM
+The mailutils uses @sc{pam} libraries.
+
+@item HAVE_LIBLTDL
+The @sc{gnu} wrapper library @file{libltdl} is present and is used
+by mailutils. @xref{Using libltdl,,,libtool,Using libltdl}, for
+more information on @file{libltdl} library.
+
+
+@item WITH_BDB2
+Support for Berkeley DB is compiled in (the package was configured with
+@option{--with-db2} option).
+
+@item WITH_NDBM
+Support for NDBM is compiled in (the package was configured with
+@option{--with-ndbm} option).
+
+@item WITH_OLD_DBM
+Support for old style DBM is compiled in (the package was configured with
+@option{--with-dbm} option).
+
+@item WITH_GDBM
+Support for GDBM is compiled in (the package was configured with
+@option{--with-gdbm} option). @xref{Top,,Introduction,gdbm,GNU DBM Manual}, for
+information about this library.
+
+@item WITH_GSSAPI
+Support for @sc{gssapi} is compiled in (the package was configured with
+@option{--with-gssapi} option).
+
+@item WITH_GUILE
+Support for Guile extension language is built (the package was
+configured with @option{--with-guile} option).
+@xref{Top,,Overview,guile,The Guile Reference Manual}, for information
+about Guile.
+
+@item WITH_PTHREAD
+The @sc{posix} thread support is compiled in.
+
+@item WITH_READLINE
+The readline support is enabled (the package was
+configured with @option{--with-readline} option).
+@xref{Top,,,readline,GNU Readline Library}, for more information.
+
+@item HAVE_MYSQL
+Authentication via MySQL is supported (the package was
+configured with @option{--enable-mysql} option).
+
+@item ENABLE_VIRTUAL_DOMAINS
+Support for mail virtual domains is enabled (the package was
+configured with @option{--enable-virtual-domains} option).
+
+@item ENABLE_IMAP
+Support for @sc{imap4} protocol is enabled.
+
+@item ENABLE_POP
+Support for @sc{pop3} protocol is enabled.
+
+@item ENABLE_MH
+Support for mailboxes in @sc{mh} format is enabled.
+
+@item ENABLE_SMTP
+Support for @sc{smtp} mailer is enabled.
+
+@item ENABLE_SENDMAIL
+Support for Sendmail mailer is enabled.
+
+@end table