[ILUG] Configure

[John Allen]

"John P. Looney" wrote:

>  I'm trying to modify the configure script of a package that I've made
> some modifications too. It now requires some extra libraries & header
> files. The package in question is Courier IMAP, and once I understand the
> other bits of the configure script, I'm sure I can work it out.
>
>  Here's an excerpt from a part of the script, similar to what I want to
> add. Can someone give a line by line explaination (I've tryed, and I'm not
> confident I'm right)..
>
> dnl #########################################################################
>
> dnl Prepare authpam module if libpam is available.
>
> dnl #########################################################################
>
> # Seems to check for a --with-authpam arg.
> AC_ARG_WITH(authpam,
> [ --without-authpam                  Do not include the authpam module ],
>     doauthpam="$withval")
>
> if test "$doauthpam" = "no"
> then
>     HAVE_PAM=0
>     LIBDL=""
> else # IF we have a --with-authpam, check for these headers (how?):
>     AC_CHECK_HEADERS(security/pam_appl.h Pam/pam_appl.h)
>
>     saveLIBS="$LIBS"

Save the current LIBS env var

>
>     LIBDL=""   # Does this check libdl for dlopen() ?
>     AC_CHECK_LIB(dl, dlopen, [ LIBDL="-ldl" ])

Check if we have a libdl with a dlopen function

>    LIBS="$saveLIBS"

Restore the LIBS env var



>
>     # Check libpam for pam_start()
>     AC_CHECK_LIB(pam, pam_start,
>         HAVE_PAM=1
>         LIBS="-lpam $LIBDL $LIBS"

Looking for a libpam that has pam_start

>
>     # Why check again ?
>         AC_CHECK_FUNCS(pam_setcred),
>
>         HAVE_PAM=0,
>         $LIBDL)
>     LIBS="$saveLIBS"
> fi

Looking for a libpam that has pam_setcred


>
> AC_SUBST(LIBDL) # Is this adding those flags to the LIBS line or something ?

Substitue the variable LIBDL (in Makefile.am) with a value (default the current
value of LIBDL)

>
> AC_SUBST(HAVE_PAM)
>

Substitue the variable LIBDL (in Makefile.am) with a value (default the current
value of LIBDL)

> AM_CONDITIONAL(HAVE_PAM, test "$HAVE_PAM" = 1)   # What these mean ?

#defines HAVE_PAM in your config.h if $HAVE_PAM = 1

>
>
> AUTHPAM=""
> if test "$HAVE_PAM" = 1
> then # I get lost here...
>     AUTHPAM=authpam
>     STATIC_LIST="$STATIC_LIST AUTHSTATIC(\"authpam\", auth_pam,
> auth_pam_pre)"
>     LIBAUTH="$LIBAUTH libauth-authpam.a"
> fi
>

Dunno

>
> AC_ARG_WITH(authpam-libraries,
> [ --with-authpam-libraries="libs"    Link 'libs' with authpam, this may be
>                                     required for FreeBSD 3.3],
>     authpamcrypt="$withval")
>
> AUTHPAMCRYPT="$authpamcrypt"
> AC_SUBST(AUTHPAMCRYPT)
>
> Kate
>
> --
> Microsoft. The best reason in the world to drink beer.
> http://www.redbrick.dcu.ie/~valen
>
> --
> Irish Linux Users' Group: ilug at linux.ie
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--
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John Allen,                                    Email:  john.allen at orbiscard.com
Orbis Payment Technology Ltd,                  Phone:  +353-1-2945111
3 Sandyford Park,                              Mobile: +353-86-2315986
Sandyford Industrial Estate,                   Fax:    +353-1-2945119
Dublin 18.
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