[travis] Fix for OS X

.travis.yml

@@ -25,7 +25,9 @@ branches:
   - travis
   - debian
 script:
-  - export LD_LIBRARY_PATH=`pkg-config --variable=plugindir roboptim-core`:$LD_LIBRARY_PATH;
+  - export PKG_CONFIG_PATH="$install_dir/lib/pkgconfig:$PKG_CONFIG_PATH"
+  - if [ "${TRAVIS_OS_NAME}" == "linux" ]; then export LD_LIBRARY_PATH=`pkg-config --variable=plugindir roboptim-core`:$LD_LIBRARY_PATH; fi
+  - if [ "${TRAVIS_OS_NAME}" == "osx" ]; then export DYLD_LIBRARY_PATH=`pkg-config --variable=plugindir roboptim-core`:$DYLD_LIBRARY_PATH; fi
   - if [ "${ENABLE_CXX11}" == "1" ]; then export CMAKE_ADDITIONAL_OPTIONS="-DUSE_CXX11:BOOL=ON -DROBOPTIM_PRECOMPILE_DENSE_SPARSE:BOOL=ON ${CMAKE_ADDITIONAL_OPTIONS}"; fi
   - if [ "${COVERITY_SCAN_BRANCH}" != "1" ]; then ./.travis/run build; fi
 after_success: