.travis.yml in ruby-vips-1.0.4 vs .travis.yml in ruby-vips-1.0.5

@@ -1,12 +1,19 @@
+sudo: false
+
 env:
   global:
     - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
+    - VIPS_VERSION_MAJOR=8
+    - VIPS_VERSION_MINOR=5
+    - VIPS_VERSION_MICRO=3
+    - PATH=$HOME/vips/bin:$PATH
+    - LD_LIBRARY_PATH=$HOME/vips/lib:$LD_LIBRARY_PATH
+    - PKG_CONFIG_PATH=$HOME/vips/lib/pkgconfig:$PKG_CONFIG_PATH
+    - PYTHONPATH=$HOME/vips/lib/python2.7/site-packages:$PYTHONPATH
+    - GI_TYPELIB_PATH=$HOME/vips/lib/girepository-1.0:$GI_TYPELIB_PATH
 
-env:
-  - LIBVIPS=8.4.4
-
 dist: trusty
 
 addons:
   apt:
     packages:
@@ -28,28 +35,27 @@
       - libpango1.0-dev
       - libpoppler-glib-dev
       - libwebp-dev
       - libglib2.0-dev
 
+cache:
+  directories:
+    - $HOME/vips
+
+# gobject-introspection 3.1 declares itself as 2.1 minimum, so we can't test
+# 2.0 ... in fact it seems to work if you force it, but I don't think we can do
+# that on travis
 language: ruby
 rvm:
   - 2.1
   - 2.2
   - 2.3
+  - 2.4
 
 script: "bundle exec rake"
 
 gemfile:
   - Gemfile
 
 before_install:
   - uname -a
-  - sudo apt-get update
-  - wget http://www.vips.ecs.soton.ac.uk/supported/current/vips-$LIBVIPS.tar.gz
-  - tar xvf vips-$LIBVIPS.tar.gz
-  - cd vips-$LIBVIPS
-  - >
-    CXXFLAGS=-D_GLIBCXX_USE_CXX11_ABI=0
-    ./configure --prefix=/usr
-  - make
-  - sudo make install
-  - sudo ldconfig
+  - bash install-vips.sh