diff --git a/.travis.yml b/.travis.yml
index 7f2dd9b6..3bfe5eaa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -44,16 +44,17 @@ matrix:
           branch_pattern: coverity_scan
       env: COMPILER=g++-5
 
-#    # from https://github.com/travis-ci/travis-ci/issues/6120
-#    - os: linux
-#      env:
-#        - LLVM_VERSION=3.8.0
-#        - LLVM_ARCHIVE_PATH=$HOME/clang+llvm.tar.xz
-#        - COMPILER=$HOME/clang-$LLVM_VERSION/bin/clang++
-#      before_install:
-#       - wget http://llvm.org/releases/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-14.04.tar.xz -O $LLVM_ARCHIVE_PATH
-#       - mkdir $HOME/clang-$LLVM_VERSION
-#       - tar xf $LLVM_ARCHIVE_PATH -C $HOME/clang-$LLVM_VERSION --strip-components 1
+    # from https://github.com/travis-ci/travis-ci/issues/6120
+    - os: linux
+      env:
+        - LLVM_VERSION=3.8.0
+        - LLVM_ARCHIVE_PATH=$HOME/clang+llvm.tar.xz
+        - COMPILER=$HOME/clang-$LLVM_VERSION/bin/clang++
+        - CPATH=$HOME/clang-$LLVM_VERSION/include
+      before_install:
+       - wget http://llvm.org/releases/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-14.04.tar.xz -O $LLVM_ARCHIVE_PATH
+       - mkdir $HOME/clang-$LLVM_VERSION
+       - tar xf $LLVM_ARCHIVE_PATH -C $HOME/clang-$LLVM_VERSION --strip-components 1
 
 #    - os: linux
 #      compiler: gcc