Installing oci-cli on S11.4 SRU51 failing

Hello,

The setup is:

no proxy, no certs needed
S11.4.51.132.1 i86pc
gcc version 12.1.0
Python 3.7.14
pip 20.3.4 from /usr/lib/python3.7/vendor-packages/pip (python 3.7)
try oci-cli v3.2.1 until v3.22.4
install command: ./install.sh --oci-cli-version 3.22.4 (as well just install.sh)

[...]
Collecting cryptography<39.0.0,>=3.2.1
Downloading cryptography-38.0.4.tar.gz (599 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 599.8/599.8 kB 6.6 MB/s eta 0:00:00
Installing build dependencies ... error
error: subprocess-exited-with-error

× pip subprocess to install build dependencies did not run successfully.
│ exit code: 1
[...]
Building wheels for collected packages: cffi
Building wheel for cffi (setup.py): started
Building wheel for cffi (setup.py): finished with status 'error'
error: subprocess-exited-with-error

    × python setup.py bdist_wheel did not run successfully.
    │ exit code: 1

[...]
gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -m64 -fPIC -DPIC -O3 -ffile-prefix-map=..=. -O2 -fPIC -DPIC -march=opteron -D_REENTRANT -m64 -fPIC -DPIC -O3 -ffile-prefix-map=..=. -O2 -fPIC -DPIC -march=opteron -fPIC -DFFI_BUILDING=1 -DUSE__THREAD -DHAVE_SYNC_SYNCHRONIZE -I/usr/include/ffi -I/usr/include/libffi -I/root/lib/oracle-cli/include -I/usr/include/python3.7m -c c/_cffi_backend.c -o build/temp.solaris-2.11-i86pc.64bit-3.7/c/_cffi_backend.o
c/_cffi_backend.c:15:10: fatal error: ffi.h: No such file or directory
15 | #include <ffi.h>
| ^~~~~~~
compilation terminated.
error: command 'gcc' failed with exit status 1
[...]
note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for cffi
Running setup.py clean for cffi
Failed to build cffi
Installing collected packages: wheel, typing-extensions, setuptools, semantic-version, pycparser, setuptools-rust, cffi
Running setup.py install for cffi: started
Running setup.py install for cffi: finished with status 'error'
error: subprocess-exited-with-error

    × Running setup.py install for cffi did not run successfully.
    │ exit code: 1

[...]
gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -m64 -fPIC -DPIC -O3 -ffile-prefix-map=..=. -O2 -fPIC -DPIC -march=opteron -D_REENTRANT -m64 -fPIC -DPIC -O3 -ffile-prefix-map=..=. -O2 -fPIC -DPIC -march=opteron -fPIC -DFFI_BUILDING=1 -DUSE__THREAD -DHAVE_SYNC_SYNCHRONIZE -I/usr/include/ffi -I/usr/include/libffi -I/root/lib/oracle-cli/include -I/usr/include/python3.7m -c c/_cffi_backend.c -o build/temp.solaris-2.11-i86pc.64bit-3.7/c/_cffi_backend.o
c/_cffi_backend.c:15:10: fatal error: ffi.h: No such file or directory
15 | #include <ffi.h>
| ^~~~~~~
compilation terminated.
error: command 'gcc' failed with exit status 1
[end of output]

    note: This error originates from a subprocess, and is likely not a problem with pip.
  error: legacy-install-failure

  × Encountered error while trying to install package.
  ╰─> cffi

[...]
note: This error originates from a subprocess, and is likely not a problem with pip.
Traceback (most recent call last):
File "/tmp/oci_cli_install_tmp_dbeF", line 743, in
main()
File "/tmp/oci_cli_install_tmp_dbeF", line 697, in main
install_cli(install_dir, tmp_dir, cli_version, OPTIONAL_FEATURES, dependency_dir)
File "/tmp/oci_cli_install_tmp_dbeF", line 327, in install_cli
exec_command(cmd, env=env)
File "/tmp/oci_cli_install_tmp_dbeF", line 145, in exec_command
subprocess.check_call(command_list, cwd=cwd, env=env)
File "/usr/lib/python3.7/subprocess.py", line 363, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/root/lib/oracle-cli/bin/pip', 'install', '--cache-dir', '/tmp/tmpgfj10vzx', 'oci_cli==3.22.4', '--upgrade']' returned non-zero exit status 1.
[...]

Any idea what's up here ?
Any hints are welcome.

Thanks
Stefan
Installing_oci-cli_on_S11.4_SRU51_failing.txt

Start with install.sh and the reported pip invocation for oci_cli==3.22.4, then inspect the cffi build output around the missing ffi.h header on Solaris S11.4. Compare the installer and dependency behavior across the reported OCI CLI versions. Done means the installation completes successfully on the stated Python, GCC, and Solaris setup.