Add Travis support for Mac OS Mojave

.travis.yml

@@ -1,8 +1,22 @@
 language: cpp
 
-#dist: trusty
+# Currently sudo is not required, NO ENV is used 
 sudo: false
-addons:
+
+# 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
@@ -39,10 +53,22 @@ addons:
           - valgrind
           - zip
           - qt5-default
-
-# Compiler
-compiler:
-  - gcc
+    - 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: