Solve seewave dependency which hinders installation of rroad

[kelaub]

installing rroad causes following error:
"installation of package ‘seewave’ had non-zero exit status"

[vsimko]

I cannot reproduce the bug on my machine (Linux Mint). Perhaps this is a bug in seewave package.

[vsimko]

I noticed the same problem on Travis.
The error was:

gcc -std=gnu99 -I/home/travis/R-bin/lib/R/include -DNDEBUG  -I/home/travis/R-bin/include    -fpic  -g -O2  -c stft.c -o stft.o
stft.c:3:61: fatal error: sndfile.h: No such file or directory
compilation terminated.
make: *** [stft.o] Error 1
ERROR: compilation failed for package ‘seewave’
* removing ‘/usr/local/lib/R/site-library/seewave’

Then, I searched for linux package which contains sndfile.h:

> apt-file search sndfile.h

and among the results, there was:

libsndfile1-dev: /usr/include/sndfile.h

I updated the .travis.yml file and added libsndfile1-dev as apt requirement

[vsimko]

Another problem with fftw3.h:
apt-file search fftw3.h found libfftw3-dev