building butterflow with only custom version of opencv2

 /tmp/pip-req-build-kRCkEE/butterflow/avinfo.c:5:10: fatal error: libavcodec/avcodec.h: No such file or directory
   #include <libavcodec/avcodec.h>
            ^~~~~~~~~~~~~~~~~~~~~~
  compilation terminated.
  error: command 'gcc' failed with exit status 1

  ----------------------------------------
  Failed building wheel for butterflow
  Running setup.py clean for butterflow
Failed to build butterflow
Installing collected packages: butterflow
  Running setup.py install for butterflow ... error
    Complete output from command /usr/bin/python2 -u -c "import setuptools, tokenize;__file__='/tmp/pip-req-build-kRCkEE/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-ZzkZjh/install-record.txt --single-version-externally-managed --compile:
    running install
    running build
    running build_py
    creating build
    creating build/lib.linux-x86_64-2.7
    creating build/lib.linux-x86_64-2.7/butterflow
    copying butterflow/source.py -> build/lib.linux-x86_64-2.7/butterflow
    copying butterflow/settings.py -> build/lib.linux-x86_64-2.7/butterflow
    copying butterflow/sequence.py -> build/lib.linux-x86_64-2.7/butterflow
    copying butterflow/render.py -> build/lib.linux-x86_64-2.7/butterflow
    copying butterflow/mux.py -> build/lib.linux-x86_64-2.7/butterflow
    copying butterflow/interpolate.py -> build/lib.linux-x86_64-2.7/butterflow
    copying butterflow/draw.py -> build/lib.linux-x86_64-2.7/butterflow
    copying butterflow/cli.py -> build/lib.linux-x86_64-2.7/butterflow
    copying butterflow/__main__.py -> build/lib.linux-x86_64-2.7/butterflow
    copying butterflow/__init__.py -> build/lib.linux-x86_64-2.7/butterflow
    running build_ext
    building 'butterflow.avinfo' extension
    creating build/temp.linux-x86_64-2.7
    creating build/temp.linux-x86_64-2.7/tmp
    creating build/temp.linux-x86_64-2.7/tmp/pip-req-build-kRCkEE
    creating build/temp.linux-x86_64-2.7/tmp/pip-req-build-kRCkEE/butterflow
    gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -DNDEBUG -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -I/home/nonet/Downloads/git/opencv-2.4.13.6/include -I/home/nonet/Downloads/git/opencv-2.4.13.6/modules/ocl/include -fPIC -I/usr/include/python2.7 -c /tmp/pip-req-build-kRCkEE/butterflow/avinfo.c -o build/temp.linux-x86_64-2.7/tmp/pip-req-build-kRCkEE/butterflow/avinfo.o -std=c11 -Wno-unused-variable -Wno-unused-function -Wno-cpp
    /tmp/pip-req-build-kRCkEE/butterflow/avinfo.c:5:10: fatal error: libavcodec/avcodec.h: No such file or directory
     #include <libavcodec/avcodec.h>
              ^~~~~~~~~~~~~~~~~~~~~~
    compilation terminated.
    error: command 'gcc' failed with exit status 1

    ----------------------------------------
Command "/usr/bin/python2 -u -c "import setuptools, tokenize;__file__='/tmp/pip-req-build-kRCkEE/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-ZzkZjh/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-req-build-kRCkEE/