dnl

dnl  Off-the-Record Messaging library

dnl  Copyright (C) 2004-2007  Ian Goldberg, Chris Alexander, Nikita Borisov

dnl                           <otr@cypherpunks.ca>

dnl

dnl  This library is free software; you can redistribute it and/or

dnl  modify it under the terms of version 2.1 of the GNU Lesser General

dnl  Public License as published by the Free Software Foundation.

dnl

dnl  This library is distributed in the hope that it will be useful,

dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of

dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

dnl  Lesser General Public License for more details.

dnl

dnl  You should have received a copy of the GNU Lesser General Public

dnl

dnl AM_PATH_LIBOTR([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])

dnl Test for libotr, and define LIBOTR_CFLAGS and LIBOTR_LIBS as appropriate.

dnl enables arguments --with-libotr-prefix=

dnl                   --with-libotr-inc-prefix=

dnl

dnl You must already have found libgcrypt with AM_PATH_LIBGCRYPT

dnl

dnl Adapted from alsa.m4, originally by

dnl      Richard Boulton <richard-alsa@tartarus.org>

dnl      Christopher Lansdown <lansdoct@cs.alfred.edu>

dnl      Jaroslav Kysela <perex@suse.cz>

AC_DEFUN([AM_PATH_LIBOTR],

[dnl Save the original CFLAGS, LDFLAGS, and LIBS

libotr_save_CFLAGS="$CFLAGS"

libotr_save_LDFLAGS="$LDFLAGS"

libotr_save_LIBS="$LIBS"

libotr_found=yes

dnl

dnl Get the cflags and libraries for libotr

dnl

AC_ARG_WITH(libotr-prefix,

[  --with-libotr-prefix=PFX  prefix where libotr is installed (optional)],

[libotr_prefix="$withval"], [libotr_prefix=""])

AC_ARG_WITH(libotr-inc-prefix,

[  --with-libotr-inc-prefix=PFX  prefix where libotr includes are (optional)],

[libotr_inc_prefix="$withval"], [libotr_inc_prefix=""])

dnl Add any special include directories

AC_MSG_CHECKING(for libotr CFLAGS)

if test "$libotr_inc_prefix" != "" ; then

	LIBOTR_CFLAGS="$LIBOTR_CFLAGS -I$libotr_inc_prefix"

	CFLAGS="$CFLAGS $LIBOTR_CFLAGS"

fi

AC_MSG_RESULT($LIBOTR_CFLAGS)

dnl add any special lib dirs

AC_MSG_CHECKING(for libotr LIBS)

if test "$libotr_prefix" != "" ; then

	LIBOTR_LIBS="$LIBOTR_LIBS -L$libotr_prefix"

	LDFLAGS="$LDFLAGS $LIBOTR_LIBS"

fi

dnl add the libotr library

LIBOTR_LIBS="$LIBOTR_LIBS -lotr"

LIBS="$LIBOTR_LIBS $LIBS"

AC_MSG_RESULT($LIBOTR_LIBS)

dnl Check for a working version of libotr that is of the right version.

min_libotr_version=ifelse([$1], ,3.0.0,$1)

no_libotr=""

    libotr_min_major_version=`echo $min_libotr_version | \

           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`

    libotr_min_minor_version=`echo $min_libotr_version | \

           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`

    libotr_min_sub_version=`echo $min_libotr_version | \

           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`

AC_MSG_CHECKING(for libotr headers version $libotr_min_major_version.x >= $min_libotr_version)

AC_LANG_SAVE

AC_LANG_C

AC_TRY_COMPILE([

#include <stdlib.h>

#include <libotr/version.h>

], [

#  if(OTRL_VERSION_MAJOR != $libotr_min_major_version)

#    error not present

#  else

#    if(OTRL_VERSION_MINOR > $libotr_min_minor_version)

       exit(0);

#    else

#      if(OTRL_VERSION_MINOR < $libotr_min_minor_version)

#        error not present

#      endif

#      if(OTRL_VERSION_SUB < $libotr_min_sub_version)

#        error not present

#      endif

#    endif

#  endif

exit(0);

],

  [AC_MSG_RESULT(found.)],

  [AC_MSG_RESULT(not present.)

   ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libotr not found.)])

   libotr_found=no]

)

AC_LANG_RESTORE

dnl Now that we know that we have the right version, let's see if we have the library and not just the headers.

AC_CHECK_LIB([otr], [otrl_message_receiving],,

	[ifelse([$3], , [AC_MSG_ERROR(No linkable libotr was found.)])

	 libotr_found=no],

	 $LIBGCRYPT_LIBS

)

LDFLAGS="$libotr_save_LDFLAGS"

LIBS="$libotr_save_LIBS"

if test "x$libotr_found" = "xyes" ; then

   ifelse([$2], , :, [$2])

else

   LIBOTR_CFLAGS=""

   LIBOTR_LIBS=""

   ifelse([$3], , :, [$3])

fi

dnl That should be it.  Now just export our symbols:

AC_SUBST(LIBOTR_CFLAGS)

AC_SUBST(LIBOTR_LIBS)

])