libffi not found during build

[Jorann]

During the build of the Docker image I got the following error: Package libffi was not found in the pkg-config search path.

Changing the apk command in stage 1 in the Dockerfile fixes this:

RUN apk --no-cache add \
    gcc \
    musl-dev \
    pcre-dev \
    linux-headers \
    postgresql-dev \
    python3-dev \
    # libraries installed using git
    git \
    # lxml dependencies
    libxslt-dev \
    # pillow dependencies
    jpeg-dev \
    openjpeg-dev \
    zlib-dev \ 
    libffi-dev

Complete error:

37.37   Running setup.py install for cffi: started
37.61   Running setup.py install for cffi: finished with status 'error'
37.61   error: subprocess-exited-with-error
37.61
37.61   × Running setup.py install for cffi did not run successfully.
37.61   │ exit code: 1
37.61   ╰─> [60 lines of output]
37.61       Package libffi was not found in the pkg-config search path.
37.61       Perhaps you should add the directory containing `libffi.pc'
37.61       to the PKG_CONFIG_PATH environment variable
37.61       Package 'libffi', required by 'virtual:world', not found
37.61       Package libffi was not found in the pkg-config search path.
37.61       Perhaps you should add the directory containing `libffi.pc'
37.61       to the PKG_CONFIG_PATH environment variable
37.61       Package 'libffi', required by 'virtual:world', not found
37.61       Package libffi was not found in the pkg-config search path.
37.61       Perhaps you should add the directory containing `libffi.pc'
37.61       to the PKG_CONFIG_PATH environment variable
37.61       Package 'libffi', required by 'virtual:world', not found
37.61       Package libffi was not found in the pkg-config search path.
37.61       Perhaps you should add the directory containing `libffi.pc'
37.61       to the PKG_CONFIG_PATH environment variable
37.61       Package 'libffi', required by 'virtual:world', not found
37.61       Package libffi was not found in the pkg-config search path.
37.61       Perhaps you should add the directory containing `libffi.pc'
37.61       to the PKG_CONFIG_PATH environment variable
37.61       Package 'libffi', required by 'virtual:world', not found
37.61       /usr/local/lib/python3.9/site-packages/setuptools/config/setupcfg.py:520: SetuptoolsDeprecationWarning: The license_file parameter is deprecated, use license_files instead.
37.61         warnings.warn(msg, warning_class)
37.61       running install
37.61       /usr/local/lib/python3.9/site-packages/setuptools/command/install.py:34: SetuptoolsDeprecationWarning: setup.py install is deprecated. Use build and pip and other standards-based tools.
37.61         warnings.warn(
37.61       running build
37.61       running build_py
37.61       creating build
37.61       creating build/lib.linux-aarch64-cpython-39
37.61       creating build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/api.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/cffi_opcode.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/pkgconfig.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/vengine_cpy.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/setuptools_ext.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/recompiler.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/vengine_gen.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/commontypes.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/error.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/lock.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/ffiplatform.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/__init__.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/backend_ctypes.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/verifier.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/model.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/cparser.py -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/_cffi_include.h -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/parse_c_type.h -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/_embedding.h -> build/lib.linux-aarch64-cpython-39/cffi
37.61       copying cffi/_cffi_errors.h -> build/lib.linux-aarch64-cpython-39/cffi
37.61       running build_ext
37.61       building '_cffi_backend' extension
37.61       creating build/temp.linux-aarch64-cpython-39
37.61       creating build/temp.linux-aarch64-cpython-39/c
37.61       gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -DFFI_BUILDING=1 -DUSE__THREAD -DHAVE_SYNC_SYNCHRONIZE -I/usr/include/ffi -I/usr/include/libffi -I/usr/local/include/python3.9 -c c/_cffi_backend.c -o build/temp.linux-aarch64-cpython-39/c/_cffi_backend.o
37.61       c/_cffi_backend.c:15:10: fatal error: ffi.h: No such file or directory
37.61          15 | #include <ffi.h>
37.61             |          ^~~~~~~
37.61       compilation terminated.
37.61       error: command '/usr/bin/gcc' failed with exit code 1
37.61       [end of output]
37.61
37.61   note: This error originates from a subprocess, and is likely not a problem with pip.
37.61 error: legacy-install-failure
37.61
37.61 × Encountered error while trying to install package.
37.61 ╰─> cffi
37.61
37.61 note: This is an issue with the package mentioned above, not pip.
37.61 hint: See above for output from the failure.