dnl @synopsis AX_PATH_BDB([MINIMUM-VERSION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
dnl
dnl This macro finds the latest version of Berkeley DB on the system,
dnl and ensures that the header file and library versions match. If
dnl MINIMUM-VERSION is specified, it will ensure that the library found
dnl is at least that version.
dnl
dnl It determines the name of the library as well as the path to the
dnl header file and library. It will check both the default environment
dnl as well as the default Berkeley DB install location. When found, it
dnl sets BDB_LIBS, BDB_CPPFLAGS, and BDB_LDFLAGS to the necessary
dnl values to add to LIBS, CPPFLAGS, and LDFLAGS, as well as setting
dnl BDB_VERSION to the version found. HAVE_DB_H is defined also.
dnl
dnl The option --with-bdb-dir=DIR can be used to specify a specific
dnl Berkeley DB installation to use.
dnl
dnl An example of it's use is:
dnl
dnl    AX_PATH_BDB([3],[
dnl      LIBS="$BDB_LIBS $LIBS"
dnl      LDFLAGS="$BDB_LDFLAGS $LDFLAGS"
dnl      CPPFLAGS="$CPPFLAGS $BDB_CPPFLAGS"
dnl    ])
dnl
dnl which will locate the latest version of Berkeley DB on the system,
dnl and ensure that it is version 3.0 or higher.
dnl
dnl Details: This macro does not use either AC_CHECK_HEADERS or
dnl AC_CHECK_LIB because, first, the functions inside the library are
dnl sometimes renamed to contain a version code that is only available
dnl from the db.h on the system, and second, because it is common to
dnl have multiple db.h and libdb files on a system it is important to
dnl make sure the ones being used correspond to the same version.
dnl Additionally, there are many different possible names for libdb
dnl when installed by an OS distribution, and these need to be checked
dnl if db.h does not correspond to libdb.
dnl
dnl When cross compiling, only header versions are verified since it
dnl would be difficult to check the library version. Additionally the
dnl default Berkeley DB installation locations /usr/local/BerkeleyDB*
dnl are not searched for higher versions of the library.
dnl
dnl The format for the list of library names to search came from the
dnl Cyrus IMAP distribution, although they are generated dynamically
dnl here, and only for the version found in db.h.
dnl
dnl The macro AX_COMPARE_VERSION is required to use this macro, and
dnl should be available from the Autoconf Macro Archive.
dnl
dnl The author would like to acknowledge the generous and valuable
dnl feedback from Guido Draheim, without which this macro would be far
dnl less robust, and have poor and inconsistent cross compilation
dnl support.
dnl
dnl Changes:
dnl
dnl  1/5/05 applied patch from Rafa Rzepecki to eliminate compiler
dnl         warning about unused variable, argv
dnl
dnl @category InstalledPackages
dnl @author Tim Toolan <toolan@ele.uri.edu>
dnl @version 2005-01-17
dnl @license GPLWithACException

dnl #########################################################################
AC_DEFUN([AX_PATH_BDB], [
  dnl # Used to indicate success or failure of this function.
  ax_path_bdb_ok=no

  # Add --with-bdb-dir option to configure.
  AC_ARG_WITH([bdb-dir],
    [AC_HELP_STRING([--with-bdb-dir=DIR],
                    [Berkeley DB installation directory])])

  # Check if --with-bdb-dir was specified.
  if test "x$with_bdb_dir" = "x" ; then
    # No option specified, so just search the system.
    AX_PATH_BDB_NO_OPTIONS([$1], [HIGHEST], [
      ax_path_bdb_ok=yes
    ])
   else
     # Set --with-bdb-dir option.
     ax_path_bdb_INC="$with_bdb_dir/include"
     ax_path_bdb_LIB="$with_bdb_dir/lib"

     dnl # Save previous environment, and modify with new stuff.
     ax_path_bdb_save_CPPFLAGS="$CPPFLAGS"
     CPPFLAGS="-I$ax_path_bdb_INC $CPPFLAGS"

     ax_path_bdb_save_LDFLAGS=$LDFLAGS
     LDFLAGS="-L$ax_path_bdb_LIB $LDFLAGS"

     # Check for specific header file db.h
     AC_MSG_CHECKING([db.h presence in $ax_path_bdb_INC])
     if test -f "$ax_path_bdb_INC/db.h" ; then
       AC_MSG_RESULT([yes])
       # Check for library
       AX_PATH_BDB_NO_OPTIONS([$1], [ENVONLY], [
         ax_path_bdb_ok=yes
         BDB_CPPFLAGS="-I$ax_path_bdb_INC"
         BDB_LDFLAGS="-L$ax_path_bdb_LIB"
       ])
     else
       AC_MSG_RESULT([no])
       AC_MSG_NOTICE([no usable Berkeley DB not found])
     fi

     dnl # Restore the environment.
     CPPFLAGS="$ax_path_bdb_save_CPPFLAGS"
     LDFLAGS="$ax_path_bdb_save_LDFLAGS"

  fi

  dnl # Execute ACTION-IF-FOUND / ACTION-IF-NOT-FOUND.
  if test "$ax_path_bdb_ok" = "yes" ; then
    m4_ifvaln([$2],[$2],[:])dnl
    m4_ifvaln([$3],[else $3])dnl
  fi

]) dnl AX_PATH_BDB

dnl #########################################################################
dnl Check for berkeley DB of at least MINIMUM-VERSION on system.
dnl
dnl The OPTION argument determines how the checks occur, and can be one of:
dnl
dnl   HIGHEST -  Check both the environment and the default installation
dnl              directories for Berkeley DB and choose the version that
dnl              is highest. (default)
dnl   ENVFIRST - Check the environment first, and if no satisfactory
dnl              library is found there check the default installation
dnl              directories for Berkeley DB which is /usr/local/BerkeleyDB*
dnl   ENVONLY -  Check the current environment only.
dnl
dnl Requires AX_PATH_BDB_PATH_GET_VERSION, AX_PATH_BDB_PATH_FIND_HIGHEST,
dnl          AX_PATH_BDB_ENV_CONFIRM_LIB, AX_PATH_BDB_ENV_GET_VERSION, and
dnl          AX_COMPARE_VERSION macros.
dnl
dnl Result: sets ax_path_bdb_no_options_ok to yes or no
dnl         sets BDB_LIBS, BDB_CPPFLAGS, BDB_LDFLAGS, BDB_VERSION
dnl
dnl AX_PATH_BDB_NO_OPTIONS([MINIMUM-VERSION], [OPTION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
AC_DEFUN([AX_PATH_BDB_NO_OPTIONS], [
  dnl # Used to indicate success or failure of this function.
  ax_path_bdb_no_options_ok=no

  # Values to add to environment to use Berkeley DB.
  BDB_VERSION=''
  BDB_LIBS=''
  BDB_CPPFLAGS=''
  BDB_LDFLAGS=''

  # Check cross compilation here.
  if test "x$cross_compiling" = "xyes" ; then
    # If cross compiling, can't use AC_RUN_IFELSE so do these tests.
    # The AC_PREPROC_IFELSE confirms that db.h is preprocessable,
    # and extracts the version number from it.
    AC_MSG_CHECKING([for db.h])

    AS_VAR_PUSHDEF([HEADER_VERSION],[ax_path_bdb_no_options_HEADER_VERSION])dnl
    HEADER_VERSION=''
    AC_PREPROC_IFELSE([
      AC_LANG_SOURCE([[
#include <db.h>
#ifdef DB_VERSION_MAJOR
AX_PATH_BDB_STUFF DB_VERSION_MAJOR,DB_VERSION_MINOR,DB_VERSION_PATCH
#else
AX_PATH_BDB_STUFF 1,0,0
#endif
      ]])
    ],[
      # Extract version from preprocessor output.
      HEADER_VERSION=`eval "$ac_cpp conftest.$ac_ext" 2> /dev/null \
        | grep AX_PATH_BDB_STUFF | sed 's/[[^0-9,]]//g;s/,/./g;1q'`
    ],[])

    if test "x$HEADER_VERSION" = "x" ; then
      AC_MSG_RESULT([no])
    else
      AC_MSG_RESULT([$HEADER_VERSION])

      # Check that version is high enough.
      AX_COMPARE_VERSION([$HEADER_VERSION],[ge],[$1],[
        # get major and minor version numbers
        AS_VAR_PUSHDEF([MAJ],[ax_path_bdb_no_options_MAJOR])dnl
        MAJ=`echo $HEADER_VERSION | sed 's,\..*,,'`
        AS_VAR_PUSHDEF([MIN],[ax_path_bdb_no_options_MINOR])dnl
        MIN=`echo $HEADER_VERSION | sed 's,^[[0-9]]*\.,,;s,\.[[0-9]]*$,,'`

	dnl # Save LIBS.
	ax_path_bdb_no_options_save_LIBS="$LIBS"

        # Check that we can link with the library.
        AC_SEARCH_LIBS([db_version],
          [db db-$MAJ.$MIN db$MAJ.$MIN db$MAJ$MIN db-$MAJ db$MAJ],[
            # Sucessfully found library.
            ax_path_bdb_no_options_ok=yes
            BDB_VERSION=$HEADER_VERSION

	    # Extract library from LIBS
	    ax_path_bdb_no_options_LEN=` \
              echo "x$ax_path_bdb_no_options_save_LIBS" \
              | awk '{print(length)}'`
            BDB_LIBS=`echo "x$LIBS " \
              | sed "s/.\{$ax_path_bdb_no_options_LEN\}\$//;s/^x//;s/ //g"`
        ],[])

        dnl # Restore LIBS
	LIBS="$ax_path_bdb_no_options_save_LIBS"

        AS_VAR_POPDEF([MAJ])dnl
        AS_VAR_POPDEF([MIN])dnl
      ])
    fi

    AS_VAR_POPDEF([HEADER_VERSION])dnl
  else
    # Not cross compiling.
    # Check version of Berkeley DB in the current environment.
    AX_PATH_BDB_ENV_GET_VERSION([
      AX_COMPARE_VERSION([$ax_path_bdb_env_get_version_VERSION],[ge],[$1],[
        # Found acceptable version in current environment.
        ax_path_bdb_no_options_ok=yes
        BDB_VERSION="$ax_path_bdb_env_get_version_VERSION"
        BDB_LIBS="$ax_path_bdb_env_get_version_LIBS"
      ])
    ])

    # Determine if we need to search /usr/local/BerkeleyDB*
    ax_path_bdb_no_options_DONE=no
    if test "x$2" = "xENVONLY" ; then
      ax_path_bdb_no_options_DONE=yes
    elif test "x$2" = "xENVFIRST" ; then
      ax_path_bdb_no_options_DONE=$ax_path_bdb_no_options_ok
    fi

    if test "$ax_path_bdb_no_options_DONE" = "no" ; then
      ax_compare_version=false
      # Check for highest in /usr/local/BerkeleyDB*
      AX_PATH_BDB_PATH_FIND_HIGHEST([
        if test "$ax_path_bdb_no_options_ok" = "yes" ; then
        # If we already have an acceptable version use this if higher.
          AX_COMPARE_VERSION(
             [$ax_path_bdb_path_find_highest_VERSION],[gt],[$BDB_VERSION])
        else
          # Since we didn't have an acceptable version check if this one is.
          AX_COMPARE_VERSION(
             [$ax_path_bdb_path_find_highest_VERSION],[ge],[$1])
        fi
      ])

      dnl # If result from _AX_COMPARE_VERSION is true we want this version.
      if test "$ax_compare_version" = "true" ; then
        ax_path_bdb_no_options_ok=yes
        BDB_LIBS="-ldb"
	if test "x$ax_path_bdb_path_find_highest_DIR" != x ; then
	  BDB_CPPFLAGS="-I$ax_path_bdb_path_find_highest_DIR/include"
	  BDB_LDFLAGS="-L$ax_path_bdb_path_find_highest_DIR/lib"
	fi
        BDB_VERSION="$ax_path_bdb_path_find_highest_VERSION"
      fi
    fi
  fi

  dnl # Execute ACTION-IF-FOUND / ACTION-IF-NOT-FOUND.
  if test "$ax_path_bdb_no_options_ok" = "yes" ; then
    AC_MSG_NOTICE([using Berkeley DB version $BDB_VERSION])
    AC_DEFINE([HAVE_DB_H],[1],
              [Define to 1 if you have the <db.h> header file.])
    m4_ifvaln([$3],[$3])dnl
  else
    AC_MSG_NOTICE([no Berkeley DB version $1 or higher found])
    m4_ifvaln([$4],[$4])dnl
  fi
]) dnl AX_PATH_BDB_NO_OPTIONS

dnl #########################################################################
dnl Check the default installation directory for Berkeley DB which is
dnl of the form /usr/local/BerkeleyDB* for the highest version.
dnl
dnl Result: sets ax_path_bdb_path_find_highest_ok to yes or no,
dnl         sets ax_path_bdb_path_find_highest_VERSION to version,
dnl         sets ax_path_bdb_path_find_highest_DIR to directory.
dnl
dnl AX_PATH_BDB_PATH_FIND_HIGHEST([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
AC_DEFUN([AX_PATH_BDB_PATH_FIND_HIGHEST], [
  dnl # Used to indicate success or failure of this function.
  ax_path_bdb_path_find_highest_ok=no

  AS_VAR_PUSHDEF([VERSION],[ax_path_bdb_path_find_highest_VERSION])dnl
  VERSION=''

  ax_path_bdb_path_find_highest_DIR=''

  # find highest verison in default install directory for Berkeley DB
  AS_VAR_PUSHDEF([CURDIR],[ax_path_bdb_path_find_highest_CURDIR])dnl
  AS_VAR_PUSHDEF([CUR_VERSION],[ax_path_bdb_path_get_version_VERSION])dnl

  for CURDIR in `ls -d /usr/local/BerkeleyDB* 2> /dev/null`
  do
    AX_PATH_BDB_PATH_GET_VERSION([$CURDIR],[
      AX_COMPARE_VERSION([$CUR_VERSION],[gt],[$VERSION],[
        ax_path_bdb_path_find_highest_ok=yes
        ax_path_bdb_path_find_highest_DIR="$CURDIR"
        VERSION="$CUR_VERSION"
      ])
    ])
  done

  AS_VAR_POPDEF([VERSION])dnl
  AS_VAR_POPDEF([CUR_VERSION])dnl
  AS_VAR_POPDEF([CURDIR])dnl

  dnl # Execute ACTION-IF-FOUND / ACTION-IF-NOT-FOUND.
  if test "$ax_path_bdb_path_find_highest_ok" = "yes" ; then
    m4_ifvaln([$1],[$1],[:])dnl
    m4_ifvaln([$2],[else $2])dnl
  fi

]) dnl AX_PATH_BDB_PATH_FIND_HIGHEST

dnl #########################################################################
dnl Checks for Berkeley DB in specified directory's lib and include
dnl subdirectories.
dnl
dnl Result: sets ax_path_bdb_path_get_version_ok to yes or no,
dnl         sets ax_path_bdb_path_get_version_VERSION to version.
dnl
dnl AX_PATH_BDB_PATH_GET_VERSION(BDB-DIR, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
AC_DEFUN([AX_PATH_BDB_PATH_GET_VERSION], [
  dnl # Used to indicate success or failure of this function.
  ax_path_bdb_path_get_version_ok=no

  # Indicate status of checking for Berkeley DB header.
  AC_MSG_CHECKING([in $1/include for db.h])
  ax_path_bdb_path_get_version_got_header=no
  test -f "$1/include/db.h" && ax_path_bdb_path_get_version_got_header=yes
  AC_MSG_RESULT([$ax_path_bdb_path_get_version_got_header])

  # Indicate status of checking for Berkeley DB library.
  AC_MSG_CHECKING([in $1/lib for library -ldb])

  ax_path_bdb_path_get_version_VERSION=''

  if test -d "$1/include" && test -d "$1/lib" &&
     test "$ax_path_bdb_path_get_version_got_header" = "yes" ; then
    dnl # save and modify environment
    ax_path_bdb_path_get_version_save_CPPFLAGS="$CPPFLAGS"
    CPPFLAGS="-I$1/include $CPPFLAGS"

    ax_path_bdb_path_get_version_save_LIBS="$LIBS"
    LIBS="$LIBS -ldb"

    ax_path_bdb_path_get_version_save_LDFLAGS="$LDFLAGS"
    LDFLAGS="-L$1/lib $LDFLAGS"

    # Compile and run a program that compares the version defined in
    # the header file with a version defined in the library function
    # db_version.
    AC_RUN_IFELSE([
      AC_LANG_SOURCE([[
#include <stdio.h>
#include <db.h>
int main(int argc,char **argv)
{
  (void) argv;
#ifdef DB_VERSION_MAJOR
  int major,minor,patch;
  db_version(&major,&minor,&patch);
  if (argc > 1)
    printf("%d.%d.%d\n",DB_VERSION_MAJOR,DB_VERSION_MINOR,DB_VERSION_PATCH);
  if (DB_VERSION_MAJOR == major && DB_VERSION_MINOR == minor &&
      DB_VERSION_PATCH == patch)
    return 0;
  else
    return 1;
#else
  DB *dbp = dbopen(0, 0, 0, DB_HASH, 0);
  if(dbp) dbp->close(dbp);
  if (argc > 1)
    printf("1.0.0\n");
  if (dbp)
    return 0;
  else
    return 1;
#endif
}
      ]])
    ],[
      # Program compiled and ran, so get version by adding argument.
      ax_path_bdb_path_get_version_VERSION=`./conftest$ac_exeext x`
      ax_path_bdb_path_get_version_ok=yes
    ],[],[])

    dnl # restore environment
    CPPFLAGS="$ax_path_bdb_path_get_version_save_CPPFLAGS"
    LIBS="$ax_path_bdb_path_get_version_save_LIBS"
    LDFLAGS="$ax_path_bdb_path_get_version_save_LDFLAGS"
  fi

  dnl # Finally, execute ACTION-IF-FOUND / ACTION-IF-NOT-FOUND.
  if test "$ax_path_bdb_path_get_version_ok" = "yes" ; then
    AC_MSG_RESULT([$ax_path_bdb_path_get_version_VERSION])
    m4_ifvaln([$2],[$2])dnl
  else
    AC_MSG_RESULT([no])
    m4_ifvaln([$3],[$3])dnl
  fi
]) dnl AX_PATH_BDB_PATH_GET_VERSION

#############################################################################
dnl Checks if version of library and header match specified version.
dnl Only meant to be used by AX_PATH_BDB_ENV_GET_VERSION macro.
dnl
dnl Requires AX_COMPARE_VERSION macro.
dnl
dnl Result: sets ax_path_bdb_env_confirm_lib_ok to yes or no.
dnl
dnl AX_PATH_BDB_ENV_CONFIRM_LIB(VERSION, [LIBNAME])
AC_DEFUN([AX_PATH_BDB_ENV_CONFIRM_LIB], [
  dnl # Used to indicate success or failure of this function.
  ax_path_bdb_env_confirm_lib_ok=no

  dnl # save and modify environment to link with library LIBNAME
  ax_path_bdb_env_confirm_lib_save_LIBS="$LIBS"
  LIBS="$LIBS $2"

  # Compile and run a program that compares the version defined in
  # the header file with a version defined in the library function
  # db_version.
  AC_RUN_IFELSE([
    AC_LANG_SOURCE([[
#include <stdio.h>
#include <db.h>
int main(int argc,char **argv)
{
  (void) argv;
#ifdef DB_VERSION_MAJOR
  int major,minor,patch;
  db_version(&major,&minor,&patch);
  if (argc > 1)
    printf("%d.%d.%d\n",DB_VERSION_MAJOR,DB_VERSION_MINOR,DB_VERSION_PATCH);
  if (DB_VERSION_MAJOR == major && DB_VERSION_MINOR == minor &&
      DB_VERSION_PATCH == patch)
    return 0;
  else
    return 1;
#else
  DB *dbp = dbopen(0, 0, 0, DB_HASH, 0);
  if(dbp) dbp->close(dbp);
  if (argc > 1)
    printf("1.0.0\n");
  if (dbp)
    return 0;
  else
    return 1;
#endif
}
    ]])
  ],[
    # Program compiled and ran, so get version by giving an argument,
    # which will tell the program to print the output.
    ax_path_bdb_env_confirm_lib_VERSION=`./conftest$ac_exeext x`

    # If the versions all match up, indicate success.
    AX_COMPARE_VERSION([$ax_path_bdb_env_confirm_lib_VERSION],[eq],[$1],[
      ax_path_bdb_env_confirm_lib_ok=yes
    ])
  ],[],[])

  dnl # restore environment
  LIBS="$ax_path_bdb_env_confirm_lib_save_LIBS"

]) dnl AX_PATH_BDB_ENV_CONFIRM_LIB

#############################################################################
dnl Finds the version and library name for Berkeley DB in the
dnl current environment.  Tries many different names for library.
dnl
dnl Requires AX_PATH_BDB_ENV_CONFIRM_LIB macro.
dnl
dnl Result: set ax_path_bdb_env_get_version_ok to yes or no,
dnl         set ax_path_bdb_env_get_version_VERSION to the version found,
dnl         and ax_path_bdb_env_get_version_LIBNAME to the library name.
dnl
dnl AX_PATH_BDB_ENV_GET_VERSION([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
AC_DEFUN([AX_PATH_BDB_ENV_GET_VERSION], [
  dnl # Used to indicate success or failure of this function.
  ax_path_bdb_env_get_version_ok=no

  ax_path_bdb_env_get_version_VERSION=''
  ax_path_bdb_env_get_version_LIBS=''

  AS_VAR_PUSHDEF([HEADER_VERSION],[ax_path_bdb_env_get_version_HEADER_VERSION])dnl
  AS_VAR_PUSHDEF([TEST_LIBNAME],[ax_path_bdb_env_get_version_TEST_LIBNAME])dnl

  # Indicate status of checking for Berkeley DB library.
  AC_MSG_CHECKING([for db.h])

  # Compile and run a program that determines the Berkeley DB version
  # in the header file db.h.
  HEADER_VERSION=''
  AC_RUN_IFELSE([
    AC_LANG_SOURCE([[
#include <stdio.h>
#include <db.h>
int main(int argc,char **argv)
{
  (void) argv;
  if (argc > 1)
#ifdef DB_VERSION_MAJOR
    printf("%d.%d.%d\n",DB_VERSION_MAJOR,DB_VERSION_MINOR,DB_VERSION_PATCH);
#else
    printf("1.0.0\n");
#endif
  return 0;
}
    ]])
  ],[
    # Program compiled and ran, so get version by adding an argument.
    HEADER_VERSION=`./conftest$ac_exeext x`
    AC_MSG_RESULT([$HEADER_VERSION])
  ],[AC_MSG_RESULT([no])],[AC_MSG_RESULT([no])])

  # Have header version, so try to find corresponding library.
  # Looks for library names in the order:
  #   nothing, db, db-X.Y, dbX.Y, dbXY, db-X, dbX
  # and stops when it finds the first one that matches the version
  # of the header file.
  if test "x$HEADER_VERSION" != "x" ; then
    AC_MSG_CHECKING([for library containing Berkeley DB $HEADER_VERSION])

    AS_VAR_PUSHDEF([MAJOR],[ax_path_bdb_env_get_version_MAJOR])dnl
    AS_VAR_PUSHDEF([MINOR],[ax_path_bdb_env_get_version_MINOR])dnl

    # get major and minor version numbers
    MAJOR=`echo $HEADER_VERSION | sed 's,\..*,,'`
    MINOR=`echo $HEADER_VERSION | sed 's,^[[0-9]]*\.,,;s,\.[[0-9]]*$,,'`

    # see if it is already specified in LIBS
    TEST_LIBNAME=''
    AX_PATH_BDB_ENV_CONFIRM_LIB([$HEADER_VERSION], [$TEST_LIBNAME])

    if test "$ax_path_bdb_env_confirm_lib_ok" = "no" ; then
      # try format "db"
      TEST_LIBNAME='-ldb'
      AX_PATH_BDB_ENV_CONFIRM_LIB([$HEADER_VERSION], [$TEST_LIBNAME])
    fi

    if test "$ax_path_bdb_env_confirm_lib_ok" = "no" ; then
      # try format "db-X.Y"
      TEST_LIBNAME="-ldb-${MAJOR}.$MINOR"
      AX_PATH_BDB_ENV_CONFIRM_LIB([$HEADER_VERSION], [$TEST_LIBNAME])
    fi

    if test "$ax_path_bdb_env_confirm_lib_ok" = "no" ; then
      # try format "dbX.Y"
      TEST_LIBNAME="-ldb${MAJOR}.$MINOR"
      AX_PATH_BDB_ENV_CONFIRM_LIB([$HEADER_VERSION], [$TEST_LIBNAME])
    fi

    if test "$ax_path_bdb_env_confirm_lib_ok" = "no" ; then
      # try format "dbXY"
      TEST_LIBNAME="-ldb$MAJOR$MINOR"
      AX_PATH_BDB_ENV_CONFIRM_LIB([$HEADER_VERSION], [$TEST_LIBNAME])
    fi

    if test "$ax_path_bdb_env_confirm_lib_ok" = "no" ; then
      # try format "db-X"
      TEST_LIBNAME="-ldb-$MAJOR"
      AX_PATH_BDB_ENV_CONFIRM_LIB([$HEADER_VERSION], [$TEST_LIBNAME])
    fi

    if test "$ax_path_bdb_env_confirm_lib_ok" = "no" ; then
      # try format "dbX"
      TEST_LIBNAME="-ldb$MAJOR"
      AX_PATH_BDB_ENV_CONFIRM_LIB([$HEADER_VERSION], [$TEST_LIBNAME])
    fi

    dnl # Found a valid library.
    if test "$ax_path_bdb_env_confirm_lib_ok" = "yes" ; then
      if test "x$TEST_LIBNAME" = "x" ; then
        AC_MSG_RESULT([none required])
      else
        AC_MSG_RESULT([$TEST_LIBNAME])
      fi
      ax_path_bdb_env_get_version_VERSION="$HEADER_VERSION"
      ax_path_bdb_env_get_version_LIBS="$TEST_LIBNAME"
      ax_path_bdb_env_get_version_ok=yes
    else
      AC_MSG_RESULT([no])
    fi

    AS_VAR_POPDEF([MAJOR])dnl
    AS_VAR_POPDEF([MINOR])dnl
  fi

  AS_VAR_POPDEF([HEADER_VERSION])dnl
  AS_VAR_POPDEF([TEST_LIBNAME])dnl

  dnl # Execute ACTION-IF-FOUND / ACTION-IF-NOT-FOUND.
  if test "$ax_path_bdb_env_confirm_lib_ok" = "yes" ; then
    m4_ifvaln([$1],[$1],[:])dnl
    m4_ifvaln([$2],[else $2])dnl
  fi

]) dnl BDB_ENV_GET_VERSION

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