Add a configure time check for db >= 4.6.master

The check alters the global CPPFLAGS and LDFLAGS to include the
proper db.h and link against the proper shared object.

3 files changed, 784 insertions, 1 deletions

diff --git a/acinclude.m4 b/acinclude.m4
index 3a5c635..6358d03 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -524,3 +524,773 @@ $1],dnl
 $2])
 CPPFLAGS="$save_CPPFLAGS"
 ])
+
+
+# ===========================================================================
+#       http://www.nongnu.org/autoconf-archive/ax_compare_version.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_COMPARE_VERSION(VERSION_A, OP, VERSION_B, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
+#
+# DESCRIPTION
+#
+#   This macro compares two version strings. Due to the various number of
+#   minor-version numbers that can exist, and the fact that string
+#   comparisons are not compatible with numeric comparisons, this is not
+#   necessarily trivial to do in a autoconf script. This macro makes doing
+#   these comparisons easy.
+#
+#   The six basic comparisons are available, as well as checking equality
+#   limited to a certain number of minor-version levels.
+#
+#   The operator OP determines what type of comparison to do, and can be one
+#   of:
+#
+#    eq  - equal (test A == B)
+#    ne  - not equal (test A != B)
+#    le  - less than or equal (test A <= B)
+#    ge  - greater than or equal (test A >= B)
+#    lt  - less than (test A < B)
+#    gt  - greater than (test A > B)
+#
+#   Additionally, the eq and ne operator can have a number after it to limit
+#   the test to that number of minor versions.
+#
+#    eq0 - equal up to the length of the shorter version
+#    ne0 - not equal up to the length of the shorter version
+#    eqN - equal up to N sub-version levels
+#    neN - not equal up to N sub-version levels
+#
+#   When the condition is true, shell commands ACTION-IF-TRUE are run,
+#   otherwise shell commands ACTION-IF-FALSE are run. The environment
+#   variable 'ax_compare_version' is always set to either 'true' or 'false'
+#   as well.
+#
+#   Examples:
+#
+#     AX_COMPARE_VERSION([3.15.7],[lt],[3.15.8])
+#     AX_COMPARE_VERSION([3.15],[lt],[3.15.8])
+#
+#   would both be true.
+#
+#     AX_COMPARE_VERSION([3.15.7],[eq],[3.15.8])
+#     AX_COMPARE_VERSION([3.15],[gt],[3.15.8])
+#
+#   would both be false.
+#
+#     AX_COMPARE_VERSION([3.15.7],[eq2],[3.15.8])
+#
+#   would be true because it is only comparing two minor versions.
+#
+#     AX_COMPARE_VERSION([3.15.7],[eq0],[3.15])
+#
+#   would be true because it is only comparing the lesser number of minor
+#   versions of the two values.
+#
+#   Note: The characters that separate the version numbers do not matter. An
+#   empty string is the same as version 0. OP is evaluated by autoconf, not
+#   configure, so must be a string, not a variable.
+#
+#   The author would like to acknowledge Guido Draheim whose advice about
+#   the m4_case and m4_ifvaln functions make this macro only include the
+#   portions necessary to perform the specific comparison specified by the
+#   OP argument in the final configure script.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Tim Toolan <toolan@ele.uri.edu>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved.
+
+dnl #########################################################################
+AC_DEFUN([AX_COMPARE_VERSION], [
+  AC_PROG_AWK
+
+  # Used to indicate true or false condition
+  ax_compare_version=false
+
+  # Convert the two version strings to be compared into a format that
+  # allows a simple string comparison.  The end result is that a version
+  # string of the form 1.12.5-r617 will be converted to the form
+  # 0001001200050617.  In other words, each number is zero padded to four
+  # digits, and non digits are removed.
+  AS_VAR_PUSHDEF([A],[ax_compare_version_A])
+  A=`echo "$1" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
+                     -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/[[^0-9]]//g'`
+
+  AS_VAR_PUSHDEF([B],[ax_compare_version_B])
+  B=`echo "$3" | sed -e 's/\([[0-9]]*\)/Z\1Z/g' \
+                     -e 's/Z\([[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/Z\([[0-9]][[0-9]][[0-9]]\)Z/Z0\1Z/g' \
+                     -e 's/[[^0-9]]//g'`
+
+  dnl # In the case of le, ge, lt, and gt, the strings are sorted as necessary
+  dnl # then the first line is used to determine if the condition is true.
+  dnl # The sed right after the echo is to remove any indented white space.
+  m4_case(m4_tolower($2),
+  [lt],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/false/;s/x${B}/true/;1q"`
+  ],
+  [gt],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort | sed "s/x${A}/false/;s/x${B}/true/;1q"`
+  ],
+  [le],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort | sed "s/x${A}/true/;s/x${B}/false/;1q"`
+  ],
+  [ge],[
+    ax_compare_version=`echo "x$A
+x$B" | sed 's/^ *//' | sort -r | sed "s/x${A}/true/;s/x${B}/false/;1q"`
+  ],[
+    dnl Split the operator from the subversion count if present.
+    m4_bmatch(m4_substr($2,2),
+    [0],[
+      # A count of zero means use the length of the shorter version.
+      # Determine the number of characters in A and B.
+      ax_compare_version_len_A=`echo "$A" | $AWK '{print(length)}'`
+      ax_compare_version_len_B=`echo "$B" | $AWK '{print(length)}'`
+
+      # Set A to no more than B's length and B to no more than A's length.
+      A=`echo "$A" | sed "s/\(.\{$ax_compare_version_len_B\}\).*/\1/"`
+      B=`echo "$B" | sed "s/\(.\{$ax_compare_version_len_A\}\).*/\1/"`
+    ],
+    [[0-9]+],[
+      # A count greater than zero means use only that many subversions
+      A=`echo "$A" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
+      B=`echo "$B" | sed "s/\(\([[0-9]]\{4\}\)\{m4_substr($2,2)\}\).*/\1/"`
+    ],
+    [.+],[
+      AC_WARNING(
+        [illegal OP numeric parameter: $2])
+    ],[])
+
+    # Pad zeros at end of numbers to make same length.
+    ax_compare_version_tmp_A="$A`echo $B | sed 's/./0/g'`"
+    B="$B`echo $A | sed 's/./0/g'`"
+    A="$ax_compare_version_tmp_A"
+
+    # Check for equality or inequality as necessary.
+    m4_case(m4_tolower(m4_substr($2,0,2)),
+    [eq],[
+      test "x$A" = "x$B" && ax_compare_version=true
+    ],
+    [ne],[
+      test "x$A" != "x$B" && ax_compare_version=true
+    ],[
+      AC_WARNING([illegal OP parameter: $2])
+    ])
+  ])
+
+  AS_VAR_POPDEF([A])dnl
+  AS_VAR_POPDEF([B])dnl
+
+  dnl # Execute ACTION-IF-TRUE / ACTION-IF-FALSE.
+  if test "$ax_compare_version" = "true" ; then
+    m4_ifvaln([$4],[$4],[:])dnl
+    m4_ifvaln([$5],[else $5])dnl
+  fi
+]) dnl AX_COMPARE_VERSION
+
+
+
+
+
+# ===========================================================================
+#           http://www.nongnu.org/autoconf-archive/ax_path_bdb.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_PATH_BDB([MINIMUM-VERSION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+#
+# DESCRIPTION
+#
+#   This macro finds the latest version of Berkeley DB on the system, and
+#   ensures that the header file and library versions match. If
+#   MINIMUM-VERSION is specified, it will ensure that the library found is
+#   at least that version.
+#
+#   It determines the name of the library as well as the path to the header
+#   file and library. It will check both the default environment as well as
+#   the default Berkeley DB install location. When found, it sets BDB_LIBS,
+#   BDB_CPPFLAGS, and BDB_LDFLAGS to the necessary values to add to LIBS,
+#   CPPFLAGS, and LDFLAGS, as well as setting BDB_VERSION to the version
+#   found. HAVE_DB_H is defined also.
+#
+#   The option --with-bdb-dir=DIR can be used to specify a specific Berkeley
+#   DB installation to use.
+#
+#   An example of it's use is:
+#
+#      AX_PATH_BDB([3],[
+#        LIBS="$BDB_LIBS $LIBS"
+#        LDFLAGS="$BDB_LDFLAGS $LDFLAGS"
+#        CPPFLAGS="$CPPFLAGS $BDB_CPPFLAGS"
+#      ])
+#
+#   which will locate the latest version of Berkeley DB on the system, and
+#   ensure that it is version 3.0 or higher.
+#
+#   Details: This macro does not use either AC_CHECK_HEADERS or AC_CHECK_LIB
+#   because, first, the functions inside the library are sometimes renamed
+#   to contain a version code that is only available from the db.h on the
+#   system, and second, because it is common to have multiple db.h and libdb
+#   files on a system it is important to make sure the ones being used
+#   correspond to the same version. Additionally, there are many different
+#   possible names for libdb when installed by an OS distribution, and these
+#   need to be checked if db.h does not correspond to libdb.
+#
+#   When cross compiling, only header versions are verified since it would
+#   be difficult to check the library version. Additionally the default
+#   Berkeley DB installation locations /usr/local/BerkeleyDB* are not
+#   searched for higher versions of the library.
+#
+#   The format for the list of library names to search came from the Cyrus
+#   IMAP distribution, although they are generated dynamically here, and
+#   only for the version found in db.h.
+#
+#   The macro AX_COMPARE_VERSION is required to use this macro, and should
+#   be available from the Autoconf Macro Archive.
+#
+#   The author would like to acknowledge the generous and valuable feedback
+#   from Guido Draheim, without which this macro would be far less robust,
+#   and have poor and inconsistent cross compilation support.
+#
+#   Changes:
+#
+#    1/5/05 applied patch from Rafa Rzepecki to eliminate compiler
+#           warning about unused variable, argv
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Tim Toolan <toolan@ele.uri.edu>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved.
+
+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>
+AX_PATH_BDB_STUFF DB_VERSION_MAJOR,DB_VERSION_MINOR,DB_VERSION_PATCH
+      ]])
+    ],[
+      # 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 "$ax_path_bdb_no_options_DONE" = "no" ; then
+      # Check for highest in /usr/local/BerkeleyDB*
+      AX_PATH_BDB_PATH_FIND_HIGHEST([
+        if test "$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 $LDFLAGS"
+
+    # Compile and run a program that compares the version defined in
+    # the header file with a version defined in the library function
+    # db_version.
+    AC_RUN_IFELSE([
+      AC_LANG_SOURCE([[
+#include <stdio.h>
+#include <db.h>
+int main(int argc,char **argv)
+{
+  int major,minor,patch;
+  (void) argv;
+  db_version(&major,&minor,&patch);
+  if (argc > 1)
+    printf("%d.%d.%d\n",DB_VERSION_MAJOR,DB_VERSION_MINOR,DB_VERSION_PATCH);
+  if (DB_VERSION_MAJOR == major && DB_VERSION_MINOR == minor &&
+      DB_VERSION_PATCH == patch)
+    return 0;
+  else
+    return 1;
+}
+      ]])
+    ],[
+      # Program compiled and ran, so get version by adding argument.
+      ax_path_bdb_path_get_version_VERSION=`./conftest$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 $2"
+
+  # Compile and run a program that compares the version defined in
+  # the header file with a version defined in the library function
+  # db_version.
+  AC_RUN_IFELSE([
+    AC_LANG_SOURCE([[
+#include <stdio.h>
+#include <db.h>
+int main(int argc,char **argv)
+{
+  int major,minor,patch;
+  (void) argv;
+  db_version(&major,&minor,&patch);
+  if (argc > 1)
+    printf("%d.%d.%d\n",DB_VERSION_MAJOR,DB_VERSION_MINOR,DB_VERSION_PATCH);
+  if (DB_VERSION_MAJOR == major && DB_VERSION_MINOR == minor &&
+      DB_VERSION_PATCH == patch)
+    return 0;
+  else
+    return 1;
+}
+    ]])
+  ],[
+    # Program compiled and ran, so get version by giving an argument,
+    # which will tell the program to print the output.
+    ax_path_bdb_env_confirm_lib_VERSION=`./conftest$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)
+    printf("%d.%d.%d\n",DB_VERSION_MAJOR,DB_VERSION_MINOR,DB_VERSION_PATCH);
+  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 $2])dnl
+  fi
+
+]) dnl BDB_ENV_GET_VERSION
+
+#############################################################################
+
diff --git a/configure.ac b/configure.ac
index 63f6fd0..e2cb4e8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -47,6 +47,19 @@ AC_CHECK_FUNCS(strptime strtok_r)
 dnl make sure we keep ACLOCAL_FLAGS around for maintainer builds to work
 AC_SUBST(ACLOCAL_AMFLAGS, "$ACLOCAL_FLAGS -I m4")
 
+dnl = Check for libdb ======================================================
+have_bdb=no
+AX_PATH_BDB([4.6],[
+	LIBS="$BDB_LIBS"
+	LDFLAGS="$BDB_LDFLAGS $LDFLAGS"
+	CPPFLAGS="$CPPFLAGS $BDB_CPPFLAGS"
+	have_bdb=yes
+])
+if test "x$have_bdb" != "xyes"; then
+	AC_MSG_ERROR([Marina requires BDB >= 4.6])
+fi
+
+
 dnl ===============================================================
 dnl Expanded dirs
 dnl ===============================================================
diff --git a/marina/Makefile.am b/marina/Makefile.am
index a3b32e6..17624ca 100644
--- a/marina/Makefile.am
+++ b/marina/Makefile.am
@@ -17,7 +17,7 @@ INCLUDES =								\
 	-DLIBDIR=\""$(libdir)"\"					
 
 marina_SOURCES = marina.c
-marina_LDADD = libmarina.la -ldb-4.7 $(MARINA_LIBS)
+marina_LDADD = libmarina.la $(MARINA_LIBS)
 marina_LDFLAGS = -export-dynamic -no-undefined -export-symbols-regex "^[[^_]].*"
 
 libmarina_la_LDFLAGS = -export-dynamic -no-undefined -export-symbols-regex "^[[^_]].*"