Add gr-filter to Travis CI

.travis.yml

@@ -31,7 +31,7 @@ install:
   - sudo pip install scipy
   - sudo apt-get install swig
   - sudo apt-get install libcppunit-dev
-  - sudo apt-get install fftw3 fftw-dev
+  - sudo apt-get install fftw3 fftw-dev libfftw3-dev
 
   - sudo apt-get install libboost1.55-all-dev
   - sudo ldconfig
@@ -56,7 +56,7 @@ install:
   - git submodule foreach git pull origin master
   - git submodule update --init --recursive
   - mkdir build && cd build
-  - cmake -DENABLE_INTERNAL_VOLK=ON ../
+  - cmake -DENABLE_INTERNAL_VOLK=ON -DENABLE_GR_FFT=ON -DENABLE_GR_FILTER=ON ../
   - make && sudo make install
   - sudo ldconfig
   - cd ../../