fixup! Try again with the C standard

Author: mundya

.travis.yml

@@ -23,8 +23,7 @@ script:
   - make coverage
   - cd -
   # Then check that the package can be built, and run the Python tests
-  - CFLAGS="$CFLAGS --std=gnu99"
-  - python setup.py develop
+  - CFLAGS=--std=gnu99 python setup.py develop
   - >
       py.test py_tests \
               --cov rig_routing_tables \