Add Travis support for Mac OS Mojave

.travis.yml

@@ -1,48 +1,74 @@
 language: cpp
 
-#dist: trusty
+# Currently sudo is not required, NO ENV is used 
 sudo: false
-addons:
-  apt:
-    sources:
-    - ubuntu-toolchain-r-test # For newer GCC
-    - george-edison55-precise-backports # For cmake
-    packages:
-    - autoconf
-    - automake
-    - bash
-    - bison
-    - build-essential
-    - cmake
-    - ctags
-    - curl
-    - doxygen
-    - flex
-    - fontconfig
-    - g++-4.9
-    - gcc-4.9
-    - gdb
-    - git
-    - gperf
-    - libcairo2-dev
-    - libevent-dev
-    - libfontconfig1-dev
-    - liblist-moreutils-perl
-    - libncurses5-dev
-    - libx11-dev
-    - libxft-dev
-    - libxml++2.6-dev
-    - perl
-    - python
-    - texinfo
-    - time
-    - valgrind
-    - zip
-    - qt5-default
 
-# Compiler
-compiler:
-  - gcc
+# Supported Operating systems
+#os:
+#  - linux
+#  - osx
+# Create a matrix to branch the building environment
+matrix:
+  allow_failures:
+    - os: osx
+     #dist: trusty
+  include:
+    - os: linux
+    # Compiler is specified in ./travis/common.sh
+      compiler: g++-4.9
+      addons:
+        apt:
+          sources:
+          - ubuntu-toolchain-r-test # For newer GCC
+          - george-edison55-precise-backports # For cmake
+          packages:
+          - autoconf
+          - automake
+          - bash
+          - bison
+          - build-essential
+          - cmake
+          - ctags
+          - curl
+          - doxygen
+          - flex
+          - fontconfig
+          - g++-4.9
+          - gcc-4.9
+          - gdb
+          - git
+          - gperf
+          - libcairo2-dev
+          - libevent-dev
+          - libfontconfig1-dev
+          - liblist-moreutils-perl
+          - libncurses5-dev
+          - libx11-dev
+          - libxft-dev
+          - libxml++2.6-dev
+          - perl
+          - python
+          - texinfo
+          - time
+          - valgrind
+          - zip
+          - qt5-default
+    - os: osx
+      osx_image: xcode10.2 # we target latest MacOS Mojave
+      compiler: clang++ # Use clang instead of gcc in MacOS
+      addons:
+        homebrew:
+          packages:
+          - bison
+          - cmake
+          - ctags
+          - flex
+          - fontconfig
+          - git
+          - gcc@6
+          - gcc@4.9
+          - libxml++
+          - qt5
 
 before_install: