dont build on osx in travis

.travis.yml

@@ -2,7 +2,6 @@ language: cpp
 
 os:
     - linux
-    - osx
 
 compiler:
     - gcc
@@ -15,6 +14,9 @@ addons:
     packages:
       - cmake
 
+before_install:
+  - export LD_LIBRARY_PATH=$(if [[ $C == "clang" ]]; then echo -n '/usr/local/clang/lib'; fi)
+
 before_script:
   - mkdir build
   - cd build