DO NOT MERGE: travis: MORE VERSIONS

.travis.yml

@@ -6,26 +6,45 @@
 language: c
 sudo: false
 addons:
-  apt:
+  apt: &apt
     sources:
       - hvr-ghc
-    packages:
-      - ghc-7.6.3
-      - ghc-7.8.4
-      - ghc-7.10.1
-      - cabal-install-1.22
+cabal: &cabal cabal-install-1.22
 env:
   global:
     - CABALVER=1.22
-  matrix:
-    - GHCVER=7.6.3
-    - GHCVER=7.8.4
-    - GHCVER=7.10.1
+matrix:
+  include:
+    - env: GHCVER=7.4.2
+      compiler: ': #GHC-7.4.2'
+      addons:
+        apt:
+          <<: *apt
+          packages: [ghc-7.4.2, *cabal]
+    - env: GHCVER=7.6.3
+      compiler: ': #GHC-7.6.3'
+      addons:
+        apt:
+          <<: *apt
+          packages: [ghc-7.6.3, *cabal]
+    - env: GHCVER=7.8.4
+      compiler: ': #GHC-7.8.4'
+      addons:
+        apt:
+          <<: *apt
+          packages: [ghc-7.8.4, *cabal]
+    - env: GHCVER=7.10.1
+      compiler: ': #GHC-7.10.1'
+      addons:
+        apt:
+          <<: *apt
+          packages: [ghc-7.10.1, *cabal]
 cache:
   directories:
     - '$HOME/.ghc'
     - '$HOME/.cabal'
 before_install:
+  - unset CC
   - './_test/bootstrap.sh'
 install:
   - true

_test/bootstrap.sh

@@ -24,4 +24,5 @@ cabal install \
       parallel \
       stm \
       old-locale \
+      unix \
       lens