diff --git a/ext/dba/config.m4 b/ext/dba/config.m4
index 8dc8f1d..4269b1c 100644
--- a/ext/dba/config.m4
+++ b/ext/dba/config.m4
@@ -83,16 +83,16 @@ PHP_ARG_WITH(ndbm,,
 [  --with-ndbm[=DIR]         DBA: NDBM support], no, no)
 
 PHP_ARG_WITH(db4,,
-[  --with-db4[=DIR]          DBA: Berkeley DB4 support], no, no)
+[  --with-db4[=DIR]          DBA: Oracle Berkeley DB 4.x or 5.x support], no, no)
 
 PHP_ARG_WITH(db3,,
-[  --with-db3[=DIR]          DBA: Berkeley DB3 support], no, no)
+[  --with-db3[=DIR]          DBA: Oracle Berkeley DB 3.x support], no, no)
 
 PHP_ARG_WITH(db2,,
-[  --with-db2[=DIR]          DBA: Berkeley DB2 support], no, no)
+[  --with-db2[=DIR]          DBA: Oracle Berkeley DB 2.x support], no, no)
 
 PHP_ARG_WITH(db1,,
-[  --with-db1[=DIR]          DBA: Berkeley DB1 support/emulation], no, no)
+[  --with-db1[=DIR]          DBA: Oracle Berkeley DB 1.x support/emulation], no, no)
 
 PHP_ARG_WITH(dbm,,
 [  --with-dbm[=DIR]          DBA: DBM support], no, no)
@@ -210,7 +210,7 @@ AC_DEFUN([PHP_DBA_DB_CHECK],[
         ],[
           AC_EGREP_CPP(yes,[
 #include "$THIS_INCLUDE"
-#if DB_VERSION_MAJOR == $1
+#if DB_VERSION_MAJOR == $1 || ($1 == 4 && DB_VERSION_MAJOR == 5)
             yes
 #endif
           ],[
@@ -233,7 +233,7 @@ AC_DEFUN([PHP_DBA_DB_CHECK],[
     AC_MSG_CHECKING([for DB4 minor version and patch level])
     AC_EGREP_CPP(yes,[
 #include "$THIS_INCLUDE"
-#if DB_VERSION_MINOR != 1 || DB_VERSION_PATCH >= 25
+#if DB_VERSION_MAJOR > 4 || (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR != 1) || (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR == 1 && DB_VERSION_PATCH >= 25)
       yes
 #endif
     ],[
@@ -274,12 +274,25 @@ AC_DEFUN([PHP_DBA_DB_CHECK],[
 # DB4
 if test "$PHP_DB4" != "no"; then
   PHP_DBA_STD_BEGIN
-  dbdp="/usr/local/BerkeleyDB.4."
-  for i in $PHP_DB4 ${dbdp}8 ${dbdp}7 ${dbdp}6 ${dbdp}5 ${dbdp}4 ${dbdp}3 ${dbdp}2 ${dbdp}1 ${dbdp}0 /usr/local /usr; do
-    if test -f "$i/db4/db.h"; then
+  dbdp4="/usr/local/BerkeleyDB.4."
+  dbdp5="/usr/local/BerkeleyDB.5."
+  for i in $PHP_DB4 ${dbdp5}1 ${dbdp5}0 ${dbdp4}8 ${dbdp4}7 ${dbdp4}6 ${dbdp4}5 ${dbdp4}4 ${dbdp4}3 ${dbdp4}2 ${dbdp4}1 ${dbdp}0 /usr/local /usr; do
+    if test -f "$i/db5/db.h"; then
+      THIS_PREFIX=$i
+      THIS_INCLUDE=$i/db5/db.h
+      break
+    elif test -f "$i/db4/db.h"; then
       THIS_PREFIX=$i
       THIS_INCLUDE=$i/db4/db.h
       break
+    elif test -f "$i/include/db5.1/db.h"; then
+      THIS_PREFIX=$i
+      THIS_INCLUDE=$i/include/db5.1/db.h
+      break
+    elif test -f "$i/include/db5.0/db.h"; then
+      THIS_PREFIX=$i
+      THIS_INCLUDE=$i/include/db5.0/db.h
+      break
     elif test -f "$i/include/db4.8/db.h"; then
       THIS_PREFIX=$i
       THIS_INCLUDE=$i/include/db4.8/db.h
@@ -314,7 +327,7 @@ if test "$PHP_DB4" != "no"; then
       break
     fi
   done
-  PHP_DBA_DB_CHECK(4, db-4.8 db-4.7 db-4.6 db-4.5 db-4.4 db-4.3 db-4.2 db-4.1 db-4.0 db-4 db4 db, [(void)db_create((DB**)0, (DB_ENV*)0, 0)])
+  PHP_DBA_DB_CHECK(4, db-5.1 db-5.0 db-4.8 db-4.7 db-4.6 db-4.5 db-4.4 db-4.3 db-4.2 db-4.1 db-4.0 db-4 db4 db, [(void)db_create((DB**)0, (DB_ENV*)0, 0)])
 fi
 PHP_DBA_STD_RESULT(db4,Berkeley DB4)
 
diff --git a/ext/dba/dba_db4.c b/ext/dba/dba_db4.c
index 6bf0095..a75d438 100644
--- a/ext/dba/dba_db4.c
+++ b/ext/dba/dba_db4.c
@@ -37,25 +37,26 @@
 #endif
 
 static void php_dba_db4_errcall_fcn(
-#if (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR >= 3)
+#if (DB_VERSION_MAJOR > 4 || (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR >= 3))
 	const DB_ENV *dbenv, 
 #endif
 	const char *errpfx, const char *msg)
 {
 	TSRMLS_FETCH();
 
-#if (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR == 8 && DB_VERSION_PATCH <= 26) 
+#if (DB_VERSION_MAJOR == 5 || (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR == 8))
 /* Bug 51086, Berkeley DB 4.8.26 */
-/* This code suppresses a BDB 4.8 error message that BDB incorrectly emits */
+/* This code suppresses a BDB 4.8+ error message, thus keeping PHP test compatibility */
 	{
 		char *function = get_active_function_name(TSRMLS_C);
 		if (function && (!strcmp(function,"dba_popen") || !strcmp(function,"dba_open"))
-			&& !strncmp(msg, "fop_read_meta", sizeof("fop_read_meta")-1)) {
+			&& (!strncmp(msg, "fop_read_meta", sizeof("fop_read_meta")-1)
+				|| !strncmp(msg, "BDB0004 fop_read_meta", sizeof("BDB0004 fop_read_meta")-1))) {
 			return;
 		}
 	}
 #endif
-	
+
 	php_error_docref(NULL TSRMLS_CC, E_NOTICE, "%s%s", errpfx?errpfx:"", msg);
 }
 
@@ -124,7 +125,7 @@ DBA_OPEN_FUNC(db4)
 	if ((err=db_create(&dbp, NULL, 0)) == 0) {
 	    dbp->set_errcall(dbp, php_dba_db4_errcall_fcn);
 	    if (
-#if (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR >= 1)
+#if (DB_VERSION_MAJOR > 4 || (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR >= 1))
 			(err=dbp->open(dbp, 0, info->path, NULL, type, gmode, filemode)) == 0) {
 #else
 			(err=dbp->open(dbp, info->path, NULL, type, gmode, filemode)) == 0) {