herokuデプロイエラー error: command 'gcc' failed with exit status 1

flaskでアプリを作成してherokuでデプロイをしたところ以下のエラーが出て解決できません


         Running setup.py install for PyAudio: started
           Running setup.py install for PyAudio: finished with status 'error'
           Complete output from command /app/.heroku/python/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-rrxz_4sn/PyAudio/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-hli8kyve-record/install-record.txt --single-version-externally-managed --compile:
           running install
           running build
           running build_py
           creating build
           creating build/lib.linux-x86_64-3.6
           copying src/pyaudio.py -> build/lib.linux-x86_64-3.6
           running build_ext
           building '_portaudio' extension
           creating build/temp.linux-x86_64-3.6
           creating build/temp.linux-x86_64-3.6/src
           gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -I/app/.heroku/python/include/python3.6m -c src/_portaudiomodule.c -o build/temp.linux-x86_64-3.6/src/_portaudiomodule.o
           src/_portaudiomodule.c:29:10: fatal error: portaudio.h: No such file or directory
            #include "portaudio.h"
                     ^~~~~~~~~~~~~
           compilation terminated.
           error: command 'gcc' failed with exit status 1
           
           ----------------------------------------
       Command "/app/.heroku/python/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-rrxz_4sn/PyAudio/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-hli8kyve-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-rrxz_4sn/PyAudio/
 !     Push rejected, failed to compile Python app.
 !     Push failed

Procfile
1web: gunicorn app:app --log-file=-

requirements.txt

cachetools==3.1.0
certifi==2019.3.9
chardet==3.0.4
Click==7.0
Flask==1.0.2
google-api-core==1.8.2
google-auth==1.6.3
google-cloud-speech==1.0.0
googleapis-common-protos==1.5.9
grpcio==1.19.0
gunicorn==19.9.0
idna==2.8
itsdangerous==1.1.0
Jinja2==2.10
MarkupSafe==1.1.1
protobuf==3.7.1
pyasn1==0.4.5
pyasn1-modules==0.2.4
PyAudio==0.2.11
pytz==2018.9
requests==2.21.0
rsa==4.0
six==1.12.0
urllib3==1.24.1
Werkzeug==0.15.1

runtime.txt