diff --git a/.gitignore b/.gitignore
index 12b43b0..a464544 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 lolcat.o
 censor.o
+lolcat
+censor
diff --git a/Makefile b/Makefile
index 9ce889d..c751508 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ CC ?= gcc
 CFLAGS ?= -std=c11 -Wall -Wextra -O3 -Wno-sign-compare
 LIBS := -lm
 
-DESTDIR ?= /usr/local/bin
+PREFIX ?= /usr/local
 
 all: lolcat censor
 
@@ -16,14 +16,14 @@ xterm256lut.h: xterm256lut_gen.py
 	python $< > $@
 
 lolcat: lolcat.c xterm256lut.h
-	$(CC) $(CFLAGS) -o $@ $< $(LIBS)
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $< $(LIBS)
 
 censor: censor.c
-	$(CC) $(CFLAGS) -o $@ $< $(LIBS)
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $< $(LIBS)
 
 install: lolcat censor
-	install lolcat $(DESTDIR)/lolcat
-	install censor $(DESTDIR)/censor
+	install lolcat $(DESTDIR)$(PREFIX)/bin/lolcat
+	install censor $(DESTDIR)$(PREFIX)/bin/censor
 
 clean:
 	rm -f lolcat censor
diff --git a/PKGBUILD b/PKGBUILD
index 5c2652e..baec990 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -1,7 +1,7 @@
 # Maintainer: Ricardo (XenGi) Band <email@ricardo.band>
 
 pkgname=c-lolcat
-pkgver=v1.3
+pkgver=v1.5
 pkgrel=1
 pkgdesc="High-performance implementation of lolcat"
 arch=('i686' 'x86_64')
diff --git a/README.md b/README.md
index f2d4af9..602a390 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,10 @@
 # What?
 
-![](https://raw.githubusercontent.com/jaseg/lolcat/master/LOLCat-Rainbow.jpg)
+![](./LOLCat-Rainbow.jpg)
 
 ## Screenshot
 
-![](https://raw.githubusercontent.com/jaseg/lolcat/master/screenshot.png)
+![](./screenshot.png)
 
 ![](./sl.gif)
 
@@ -44,6 +44,8 @@ $ make lolcat
 
 ### Others
 
+Note: Debian users may need the `python-is-python3` package.
+
 ```bash
 $ make && sudo make install
 ```
diff --git a/autotools/configure.ac b/autotools/configure.ac
index 8b9871b..28f5d08 100644
--- a/autotools/configure.ac
+++ b/autotools/configure.ac
@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.69])
-AC_INIT([lolcat], [1.3], [jaseg <github@jaseg.de>])
+AC_INIT([lolcat], [1.5], [jaseg <github@jaseg.de>])
 AC_CONFIG_SRCDIR([../lolcat.c])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_AUX_DIR([autoscripts])
diff --git a/do_release.sh b/do_release.sh
new file mode 100755
index 0000000..4d437e8
--- /dev/null
+++ b/do_release.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+set -e
+
+if [ $# -lt 1 ]; then
+    echo "do_release.sh must be called with a version number as its first argument."
+    exit 1
+fi
+
+if [ -n "$(git status --porcelain|grep -v '^??')" ]; then
+    echo "do_release.sh must be called from a clean working directory."
+    exit 2
+fi
+
+VER="$1"
+
+if echo "$VER" | grep -v '^[0-9]\+\.[0-9]\+$'; then
+    echo "do_release.sh must be called with a version number formatted like "1.23" as its first argument, with no leading \"v\"."
+    exit 1
+fi
+
+echo "Updating files for version v$VER"
+
+sed -i "/L\"lolcat version [0-9.]\+, (c) [0-9]\+ jaseg\\\\n\"/s/version [0-9.]\+/version $VER/" lolcat.c
+sed -i "s/^pkgver=v[0-9.]\+/pkgver=v$VER/" PKGBUILD
+sed -i "/^AC_INIT/s/\[[0-9.]\+\]/[$VER]/" autotools/configure.ac
+git add lolcat.c PKGBUILD autotools/configure.ac
+git commit -m 'Bump version to v$VER'
+git tag "v$VER"
+echo "Success."
+