Description of problem:
We want to update pip from 25.2 to 25.3 in Rawhide but openms fails to build:

https://copr.fedorainfracloud.org/coprs/churchyard/pip-25.3/package/openms/


[100%] Packaging pyopenms wheel.
cd /builddir/build/BUILD/openms-3.4.1-build/OpenMS-b886c44b4ca0625932f9874613918856774cfd8d/redhat-linux-build/pyOpenMS && /usr/bin/python3 -m pip wheel -w dist --no-deps --no-binary=pyopenms .
Processing /builddir/build/BUILD/openms-3.4.1-build/OpenMS-b886c44b4ca0625932f9874613918856774cfd8d/redhat-linux-build/pyOpenMS
  Installing build dependencies: started
  Installing build dependencies: finished with status 'error'
  error: subprocess-exited-with-error
  
  × installing build dependencies did not run successfully.
  │ exit code: 1
  ╰─> [7 lines of output]
      WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f4b6a3fe660>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f4b6a3cb250>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f4b6a3cb390>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f4b6a3cb4d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f4b6a3cb610>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/setuptools/
      ERROR: Could not find a version that satisfies the requirement setuptools>=40.8.0 (from versions: none)
      ERROR: No matching distribution found for setuptools>=40.8.0
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed to build 'file:///builddir/build/BUILD/openms-3.4.1-build/OpenMS-b886c44b4ca0625932f9874613918856774cfd8d/redhat-linux-build/pyOpenMS' when installing build dependencies
gmake[3]: Leaving directory '/builddir/build/BUILD/openms-3.4.1-build/OpenMS-b886c44b4ca0625932f9874613918856774cfd8d/redhat-linux-build'
gmake[3]: *** [src/pyOpenMS/CMakeFiles/pyopenms.dir/build.make:74: src/pyOpenMS/CMakeFiles/pyopenms] Error 1
gmake[2]: Leaving directory '/builddir/build/BUILD/openms-3.4.1-build/OpenMS-b886c44b4ca0625932f9874613918856774cfd8d/redhat-linux-build'
gmake[2]: *** [CMakeFiles/Makefile2:1555: src/pyOpenMS/CMakeFiles/pyopenms.dir/all] Error 2
gmake[1]: *** [CMakeFiles/Makefile2:1562: src/pyOpenMS/CMakeFiles/pyopenms.dir/rule] Error 2
gmake[1]: Leaving directory '/builddir/build/BUILD/openms-3.4.1-build/OpenMS-b886c44b4ca0625932f9874613918856774cfd8d/redhat-linux-build'
gmake: *** [Makefile:390: pyopenms] Error 2

error: Bad exit status from /var/tmp/rpm-tmp.P2CzXU (%build)



This looks like the following change in pip:

https://pip.pypa.io/en/stable/news/#v25-3

"""
Remove support for the deprecated setup.py bdist_wheel mechanism. Consequently, --use-pep517 is now always on, and --no-use-pep517 has been removed.
"""

https://github.com/pypa/pip/issues/6334


As a workaround, try building the package with PIP_NO_BUILD_ISOLATION=0 set -- that disables build isolation (which is a tad confusing, see https://github.com/pypa/pip/issues/5735).


Version-Release number of selected component (if applicable): 2:3.4.1-16.20250722gitb886c44

Steps to Reproduce: Build the package from distgit using our copr linked above. E.g.:

fedpkg --release rawhide mockbuild -- --addrepo=https://download.copr.fedorainfracloud.org/results/churchyard/pip-25.3/fedora-rawhide-x86_64