diff -urNp xca-0.5.1.org/widgets/MainWindow.cpp xca-0.5.1/widgets/MainWindow.cpp
--- xca-0.5.1.org/widgets/MainWindow.cpp	2004-06-13 23:22:37.000000000 +0200
+++ xca-0.5.1/widgets/MainWindow.cpp	2006-10-28 18:14:35.000000000 +0200
@@ -451,6 +451,11 @@ void MainWindow::dberr(const char *errpf
 	Error(e);
 }
 
+void MainWindow::dberrEnv(const DbEnv *dbEnv, const char *errpfx, const char *msg)
+{
+    dberr(errpfx, (char *) msg);
+}
+
 QString MainWindow::getPath()
 {
 	QString x = settings->getString("workingdir");
diff -urNp xca-0.5.1.org/widgets/MainWindow.h xca-0.5.1/widgets/MainWindow.h
--- xca-0.5.1.org/widgets/MainWindow.h	2004-04-15 01:36:56.000000000 +0200
+++ xca-0.5.1/widgets/MainWindow.h	2006-10-28 18:12:12.000000000 +0200
@@ -105,6 +105,7 @@ class MainWindow: public MainWindow_UI
 	static int passRead(char *buf, int size, int rwflag, void *userdata);
 	static int passWrite(char *buf, int size, int rwflag, void *userdata);
 	static void dberr(const char *errpfx, char *msg);
+	static void dberrEnv(const DbEnv *dbEnv, const char *errpfx, const char *msg); // db4.3 API change
 	static NewX509 *newX509();
 	static QString md5passwd(const char *pass);
 	static void Error(errorEx &err);
diff -urNp xca-0.5.1.org/widgets/MW_database.cpp xca-0.5.1/widgets/MW_database.cpp
--- xca-0.5.1.org/widgets/MW_database.cpp	2004-04-16 00:31:35.000000000 +0200
+++ xca-0.5.1/widgets/MW_database.cpp	2006-10-28 18:13:27.000000000 +0200
@@ -63,16 +63,23 @@ void MainWindow::init_database() {
 	if (dbenv) return; // already initialized....
 	try {
 		global_tid = NULL;
+
 		dbenv = new DbEnv(0);
+#if DB_VERSION_MINOR < 3
 		dbenv->set_errcall(&MainWindow::dberr);
+#else
+		dbenv->set_errcall(&MainWindow::dberrEnv);
+#endif
 		dbenv->open(QFile::encodeName(baseDir), DB_RECOVER | DB_INIT_TXN | \
 				DB_INIT_MPOOL | DB_INIT_LOG | DB_INIT_LOCK | \
 				DB_CREATE | DB_PRIVATE , 0600 );
+
 		dbenv->txn_begin(NULL, &global_tid, 0);
 #ifndef DB_AUTO_COMMIT
 #define DB_AUTO_COMMIT 0
 #endif
 		dbenv->set_flags(DB_AUTO_COMMIT,1);
+
 	}
 	catch (DbException &err) {
 		QString e = err.what();