diff --git a/README.md b/README.md
index 500b5c3b..608648eb 100644
--- a/README.md
+++ b/README.md
@@ -67,10 +67,25 @@ sudo apt-get install shadowsocks-libev
 
 #### Build package from source
 
+Supported Platforms:
+
+* Debian 7 (see below), 8, unstable
+* Ubuntu 14.10, 15.04 or higher
+
+To build packages on Debian 7 (Wheezy), you need to enable `debian-backports`
+to install systemd-compatibility packages like `dh-systemd` or `init-system-helpers`.
+
+This also means that you can only install those built packages on systems that have
+`init-system-helpers` installed.
+
+Otherwise, try to build and install directly from source. See the **Linux**
+section below.
+
 ``` bash
 cd shadowsocks-libev
-sudo apt-get install build-essential automake libtool libssl-dev gawk debhelper dh-systemd
-sh debian/autopkg.sh
+sudo apt-get install build-essential autoconf libtool libssl-dev \
+    gawk debhelper dh-systemd init-system-helpers
+dpkg-buildpackage -us -uc -i
 cd ..
 sudo dpkg -i shadowsocks-libev*.deb
 ```
@@ -78,11 +93,15 @@ sudo dpkg -i shadowsocks-libev*.deb
 #### Configure and start the service
 
 ```
-# Edit the configuration
+# Edit the configuration file
 sudo vim /etc/shadowsocks-libev/config.json
 
+# Edit the default configuration for debian
+sudo vim /etc/default/shadowsocks-libev
+
 # Start the service
-sudo /etc/init.d/shadowsocks-libev start
+sudo /etc/init.d/shadowsocks-libev start    # for sysvinit, or
+sudo systemctl start shasowsocks-libev      # for systemd
 ```
 
 ### Fedora & RHEL
diff --git a/debian/autopkg.sh b/debian/autopkg.sh
deleted file mode 100755
index cc5fe83f..00000000
--- a/debian/autopkg.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/bin/sh
-
-# Automatic deb packaging script for shadowsocks-libev
-#
-
-set -e
-if [ "$(basename $(pwd))x" = "debianx" ]; then
-    cd ..
-else
-    if [ ! "$(basename $(pwd))x" = "shadowsocks-libevx" ]; then
-        echo "Unknown Working Directory, won't continue."
-        exit 1
-    fi
-fi
-git clean -Xdf
-git reset --hard HEAD
-autoreconf --install
-rm -f ../*.tar.xz ../*.deb ../*.tar.gz ../*.build ../*.dsc ../*.changes
-CURR_PKG_DIR=$(pwd)
-tar -czvf ../$(basename $CURR_PKG_DIR)_$(cat ./configure.ac | grep AC_INIT | grep -o '[0-9]\.[0-9]\.[0-9]').orig.tar.gz . --exclude-vcs
-#dh_make --multi --createorig --yes --copyright gpl3
-A=$(which debuild > /dev/null 2> /dev/null; echo $?)
-if [ "${A}x" = "0x" ]; then
-    debuild -us -uc -i
-else
-    dpkg-buildpackage -us -uc -i
-fi
diff --git a/debian/control b/debian/control
index 8a41e41c..20bd3dd2 100644
--- a/debian/control
+++ b/debian/control
@@ -22,7 +22,7 @@ Architecture: any
 Multi-Arch: same
 Section: libs
 Priority: extra
-Breaks: shadowsocks-libev (<< 2.3.1)
+Breaks: shadowsocks-libev (<< 2.4.0)
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: lightweight and secure socks5 proxy (shared library)
@@ -35,7 +35,7 @@ Package: libshadowsocks-dev
 Architecture: any
 Section: libdevel
 Priority: extra
-Breaks: shadowsocks-libev (<< 2.3.1)
+Breaks: shadowsocks-libev (<< 2.4.0)
 Depends: libshadowsocks1 (= ${binary:Version}), ${misc:Depends}
 Description: lightweight and secure socks5 proxy (development files)
  Shadowsocks-libev is a lightweight and secure socks5 proxy for
@@ -47,7 +47,7 @@ Package: libshadowsocks-dbg
 Architecture: any
 Section: debug
 Priority: extra
-Breaks: shadowsocks-libev (<< 2.3.1)
+Breaks: shadowsocks-libev (<< 2.4.0)
 Depends: libshadowsocks1 (= ${binary:Version}), ${misc:Depends}
 Description: debugging symbols for the libshadowsocks1 library
  Shadowsocks-libev is a lightweight and secure socks5 proxy for