diff --git a/plugins/src/inputmethods/xim/qximinputcontext_x11.cpp b/plugins/src/inputmethods/xim/qximinputcontext_x11.cpp
index 108a31e7..b631d191 100644
--- a/plugins/src/inputmethods/xim/qximinputcontext_x11.cpp
+++ b/plugins/src/inputmethods/xim/qximinputcontext_x11.cpp
@@ -742,7 +742,7 @@ void TQXIMInputContext::resetClientState()
 
 void TQXIMInputContext::close( const TQString &errMsg )
 {
-    tqDebug( errMsg );
+    tqDebug( "%s", errMsg.latin1() );
     emit deletionRequested();
 }
 
diff --git a/src/3rdparty/sqlite/btree_rb.c b/src/3rdparty/sqlite/btree_rb.c
index ea4b3dda..09d8e9a1 100644
--- a/src/3rdparty/sqlite/btree_rb.c
+++ b/src/3rdparty/sqlite/btree_rb.c
@@ -311,7 +311,7 @@ static char *append_node(char * orig, BtRbNode *pNode, int indent)
 static void print_node(BtRbNode *pNode)
 {
     char * str = append_node(0, pNode, 0);
-    printf(str);
+    printf("%s", str);
 
     /* Suppress a warning message about print_node() being unused */
     (void)print_node;
diff --git a/src/3rdparty/sqlite/shell.c b/src/3rdparty/sqlite/shell.c
index 58771aa7..93210666 100644
--- a/src/3rdparty/sqlite/shell.c
+++ b/src/3rdparty/sqlite/shell.c
@@ -688,7 +688,7 @@ static int do_meta_command(char *zLine, struct callback_data *p){
   }else
 
   if( c=='h' && strncmp(azArg[0], "help", n)==0 ){
-    fprintf(stderr,zHelp);
+    fprintf(stderr,"%s",zHelp);
   }else
 
   if( c=='i' && strncmp(azArg[0], "indices", n)==0 && nArg>1 ){
diff --git a/src/moc/moc.y b/src/moc/moc.y
index 4540262b..b10e444e 100644
--- a/src/moc/moc.y
+++ b/src/moc/moc.y
@@ -2873,8 +2873,8 @@ void generateClass()		      // generate C++ source code for a class
 	    fn = &g->fileName[i];
 	fprintf( out, hdr1, (const char*)qualifiedClassName(),(const char*)fn);
 	fprintf( out, hdr2, (const char*)dstr );
-	fprintf( out, hdr3 );
-	fprintf( out, hdr4 );
+	fprintf( out, "%s", hdr3 );
+	fprintf( out, "%s", hdr4 );
 
 	if ( !g->noInclude ) {
 	    /*
diff --git a/src/moc/moc_yacc.cpp b/src/moc/moc_yacc.cpp
index 13c38b65..3d6b8cfb 100644
--- a/src/moc/moc_yacc.cpp
+++ b/src/moc/moc_yacc.cpp
@@ -5699,8 +5699,8 @@ void generateClass()		      // generate C++ source code for a class
 	    fn = &g->fileName[i];
 	fprintf( out, hdr1, (const char*)qualifiedClassName(),(const char*)fn);
 	fprintf( out, hdr2, (const char*)dstr );
-	fprintf( out, hdr3 );
-	fprintf( out, hdr4 );
+	fprintf( out, "%s", hdr3 );
+	fprintf( out, "%s", hdr4 );
 
 	if ( !g->noInclude ) {
 	    /*
diff --git a/src/sql/drivers/odbc/qsql_odbc.cpp b/src/sql/drivers/odbc/qsql_odbc.cpp
index 7abf5c59..40739b36 100644
--- a/src/sql/drivers/odbc/qsql_odbc.cpp
+++ b/src/sql/drivers/odbc/qsql_odbc.cpp
@@ -539,7 +539,7 @@ bool TQODBCPrivate::setConnectionOptions( const TQString& connOpts )
 		} else if ( val == "SQL_MODE_READ_WRITE" ) {
 		    v = SQL_MODE_READ_WRITE;
 		} else {
-		    tqWarning( TQString( "TQODBCDriver::open: Unknown option value '%1'" ).arg( *it ) );
+		    tqWarning( "TQODBCDriver::open: Unknown option value '%s'", (*it).latin1() );
 		    break;
 		}
 		r = SQLSetConnectAttr( hDbc, SQL_ATTR_ACCESS_MODE, (SQLPOINTER) v, 0 );
@@ -564,7 +564,7 @@ bool TQODBCPrivate::setConnectionOptions( const TQString& connOpts )
 		} else if ( val == "SQL_FALSE" ) {
 		    v = SQL_FALSE;
 		} else {
-		    tqWarning( TQString( "TQODBCDriver::open: Unknown option value '%1'" ).arg( *it ) );
+		    tqWarning( "TQODBCDriver::open: Unknown option value '%s'", (*it).latin1() );
 		    break;
 		}
 		r = SQLSetConnectAttr( hDbc, SQL_ATTR_METADATA_ID, (SQLPOINTER) v, 0 );
@@ -586,14 +586,14 @@ bool TQODBCPrivate::setConnectionOptions( const TQString& connOpts )
 		} else if ( val == "SQL_OPT_TRACE_ON" ) {
 		    v = SQL_OPT_TRACE_ON;
 		} else {
-		    tqWarning( TQString( "TQODBCDriver::open: Unknown option value '%1'" ).arg( *it ) );
+		    tqWarning( "TQODBCDriver::open: Unknown option value '%s'", (*it).latin1() );
 		    break;
 		}
 		r = SQLSetConnectAttr( hDbc, SQL_ATTR_TRACE, (SQLPOINTER) v, 0 );
 	    }
 #ifdef QT_CHECK_RANGE
               else {
-		  tqWarning( TQString("TQODBCDriver::open: Unknown connection attribute '%1'").arg( opt ) );
+		  tqWarning( "TQODBCDriver::open: Unknown connection attribute '%s'", opt.latin1() );
 	    }
 #endif
 	    if ( r != SQL_SUCCESS && r != SQL_SUCCESS_WITH_INFO ) {
diff --git a/tools/qvfb/qvfbview.cpp b/tools/qvfb/qvfbview.cpp
index a23bab69..15e5ca53 100644
--- a/tools/qvfb/qvfbview.cpp
+++ b/tools/qvfb/qvfbview.cpp
@@ -282,26 +282,26 @@ static TQString qws_dataDir()
     TQString dataDir = "/tmp/qtembedded-" + username;
     if ( mkdir( dataDir.latin1(), 0700 ) ) {
 	if ( errno != EEXIST ) {
-	    tqFatal( TQString("Cannot create TQt/Embedded data directory: %1")
-		    .arg( dataDir ) );
+	    tqFatal( "Cannot create TQt/Embedded data directory: %s",
+		    dataDir.latin1() );
 	}
     }
 
     struct stat buf;
     if ( lstat( dataDir.latin1(), &buf ) )
-	tqFatal( TQString( "stat failed for TQt/Embedded data directory: %1" )
-		.arg( dataDir ) );
+	tqFatal( "stat failed for TQt/Embedded data directory: %s",
+		dataDir.latin1() );
 
     if ( !S_ISDIR( buf.st_mode ) )
-	tqFatal( TQString( "%1 is not a directory" ).arg( dataDir ) );
+	tqFatal( "%s is not a directory", dataDir.latin1() );
 
     if ( buf.st_uid != getuid() )
-	tqFatal( TQString( "TQt/Embedded data directory is not owned by user %1" )
-		.arg( getuid() ) );
+	tqFatal( "TQt/Embedded data directory is not owned by user %u",
+		getuid() );
 
     if ( (buf.st_mode & 0677) != 0600 )
-	tqFatal( TQString( "TQt/Embedded data directory has incorrect permissions: %1" )
-		.arg( dataDir ) );
+	tqFatal( "TQt/Embedded data directory has incorrect permissions: %s",
+		dataDir.latin1() );
 
     dataDir += "/";