Include cmake files in HepMC3 installation

[fwyzard]

No description provided.

[fwyzard]

please test

[cmsbuild]

A new Pull Request was created by @fwyzard for branch IB/CMSSW_16_0_X/master.

@akritkbehera, @iarspider, @smuzaffar can you please review it and eventually sign? Thanks.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.
cms-bot commands are listed here

[cmsbuild]

cms-bot internal usage

[fwyzard]

@mandrenguyen @smuzaffar @iarspider apologies for being annoying, it would be great if you could squeeze this one into pre2, too 🙏🏻

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-65aa9b/49115/summary.html
COMMIT: 90c722c
CMSSW: CMSSW_16_0_X_2025-10-30-2300/el8_amd64_gcc13
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmsdist/10157/49115/install.sh to create a dev area with all the needed externals and cmssw changes.

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:

• @fwyzard Update alpaka to 2.0.0 "Concepts Ahead" #10103

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-65aa9b/49115/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-65aa9b/49115/git-merge-result

Comparison Summary

Summary:

• You potentially removed 4 lines from the logs
• Reco comparison results: 10163 differences found in the comparisons
• DQMHistoTests: Total files compared: 51
• DQMHistoTests: Total histograms compared: 3939953
• DQMHistoTests: Total failures: 71251
• DQMHistoTests: Total nulls: 45
• DQMHistoTests: Total successes: 3868637
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 50 files compared)
• Checked 218 log files, 188 edm output root files, 51 DQM output files
• TriggerResults: found differences in 4 / 49 workflows

[iarspider]

+externals

[smuzaffar]

+externals

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_16_0_X/master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @sextonkennedy, @ftenchini, @mandrenguyen (and backports should be raised in the release meeting by the corresponding L2)

[fwyzard]

Thanks !