title: While building wheel for pdftotext, command 'gcc' failed with exit status 1
body: <p>I am using Python 3.7.0, Django 3.0.4, and trying to host in Heroku. I am using windows OS and the most solution I found is on Linux. Every time I tried to push into the master of Heroku, it occurs the following error. Could anyone please help me out?</p>
  
  <pre><code>ERROR: Command errored out with exit status 1:
  remote:           command: /app/.heroku/python/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-vu13x6kn/pdftotext/setup.py'"'"'; __file__='"'"'/tmp/pip-install-vu13x6kn/pdftotext/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-quoxq88r
  remote:               cwd: /tmp/pip-install-vu13x6kn/pdftotext/
  remote:          Complete output (14 lines):
  remote:          /app/.heroku/python/lib/python3.6/distutils/dist.py:261: UserWarning: Unknown distribution option: 'long_description_content_type'
  remote:            warnings.warn(msg)
  remote:          running bdist_wheel
  remote:          running build
  remote:          running build_ext
  remote:          building 'pdftotext' extension
  remote:          creating build
  remote:          creating build/temp.linux-x86_64-3.6
  remote:          gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -DPOPPLER_CPP_AT_LEAST_0_30_0=0 -I/app/.heroku/python/include/python3.6m -c pdftotext.cpp -o build/temp.linux-x86_64-3.6/pdftotext.o -Wall
  remote:          pdftotext.cpp:3:10: fatal error: poppler/cpp/poppler-document.h: No such file or directory
  remote:           #include &lt;poppler/cpp/poppler-document.h&gt;
  remote:                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  remote:          compilation terminated.
  remote:          error: command 'gcc' failed with exit status 1
  remote:          ----------------------------------------
  remote:          ERROR: Failed building wheel for pdftotext
  </code></pre>