Fix travis tests

Author: isuruf

.travis.yml

@@ -52,7 +52,7 @@ matrix:
           packages:
           - binutils-dev
           - g++-4.8
-    - env: BUILD_TYPE="Debug" WITH_BFD="yes" PYTHON_VERSION="3.5" WITH_LLVM="yes" WITH_SCIPY="yes"
+    - env: BUILD_TYPE="Debug" WITH_BFD="yes" PYTHON_VERSION="3.5" WITH_LLVM="3.8" WITH_SCIPY="yes"
       compiler: clang
       os: linux
       addons:
@@ -85,6 +85,13 @@ matrix:
       compiler: gcc
       os: linux
 
+before_install:
+- |
+   if [ "${TRAVIS_OS_NAME}" == "osx" ]; then
+     command curl -sSL https://rvm.io/mpapis.asc | gpg --import -;
+     rvm get head || true
+   fi
+
 install:
   - export PYTHON_SOURCE_DIR=`pwd`
   - export TEST_CPP="no"