before_install_linux.sh in rmagick-2.16.0 vs before_install_linux.sh in rmagick-3.0.0

@@ -1,10 +1,15 @@
-dpkg --list imagemagick
 sudo apt-get update
-sudo apt-get remove -y imagemagick
-sudo apt-get install -y build-essential libx11-dev libxext-dev zlib1g-dev libpng12-dev libjpeg-dev libfreetype6-dev libxml2-dev
-sudo apt-get build-dep -y imagemagick
+
+# remove all existing imagemagick related packages
+sudo apt-get autoremove -y imagemagick* libmagick* --purge
+
+# install build tools, ImageMagick delegates
+sudo apt-get install -y build-essential libx11-dev libxext-dev zlib1g-dev \
+  liblcms2-dev libpng-dev libjpeg-dev libfreetype6-dev libxml2-dev \
+  libtiff5-dev vim ghostscript ccache
+
 case $IMAGEMAGICK_VERSION in
     latest)
         wget http://www.imagemagick.org/download/ImageMagick.tar.xz
         tar -xf ImageMagick.tar.xz
         cd ImageMagick-*
@@ -13,20 +18,12 @@
         wget http://www.imagemagick.org/download/releases/ImageMagick-${IMAGEMAGICK_VERSION}.tar.xz
         tar -xf ImageMagick-${IMAGEMAGICK_VERSION}.tar.xz
         cd ImageMagick-${IMAGEMAGICK_VERSION}
     ;;
 esac
-./configure --prefix=/usr $CONFIGURE_OPTIONS
+CC="ccache cc" CXX="ccache c++" ./configure --prefix=/usr $CONFIGURE_OPTIONS
+make
 sudo make install
 cd ..
 sudo ldconfig
 
-if [[ $TRAVIS_RUBY_VERSION =~ ^1.8 ]]; then
-    echo "Set the stack size to unlimited to avoid segfault for Ruby 1.8"
-    ulimit -s unlimited
-fi
-
-# Fixes this error:
-# NoMethodError: undefined method `spec' for nil:NilClass
-# Travis uses Bundler 1.7.6 by default and it has this bug
-# https://github.com/rubygems/rubygems/issues/1419
-gem install bundler
+gem install bundler -v 1.17.3