Next try: use original directory root.

.travis.yml

@@ -50,7 +50,7 @@ after_success:
   - pwd
   - ls
   - cd code/CMakeFiles/;ls assimp.dir
-  - lcov --directory code/CMakeFiles/assimp.dir/ --capture --output-file coverage.info
+  - lcov --directory . --capture --output-file coverage.info
   - lcov --remove coverage.info 'contrib/*' '/usr/*' --output-file coverage.info
   - lcov --list coverage.info
   - coveralls-lcov --repo-token ${COVERALLS_TOKEN} coverage.info