# Firewall Builder 5.3.7 Release Notes

GitHub: Issues

- Changes in support for iptables
- Changes in support for Junos
- GUI changes
- Compiler and build systems changes

## Changes in support for iptables

- Feature: fwbuilder now supports conntrack instead of state module for recent iptables

- Feature: Add support for the iptables > 1.4.20 "-w" option

- Bugfix: Fixed (potential) deadlock situation as sugested by https://github.com/antaflos

- Bugfix: Proper handling of NAT chains

- Feature: Add support for --kerneltz

## Changes in support for Junos

- Bugfix: Generated new ids for the IP fragmentation service objects in the standard object database

- Bugfix: Use correct comment symbol

## GUI changes

- Bugfix: Don't delete object in locked group

- Feature: Add new objects directly to the subfolder via context menu

## Compiler and build systems changes

- Feature: Add support for MSYS2

- Update OSX buildscript for newer XCode

- Feature: Add support for GCC 6.X

- Refactor: Gain more C++11 compatability

- Feature: W32: Add support for MXE and provide Docker environment for cross compiling