Apparently Python 3.14 made things slower:

https://buildd.debian.org/status/fetch.php?pkg=openturns&arch=riscv64&ver=1.27.1-1%2Bb1&stamp=1782768253&raw=0

...
650/650 Test #1146: pyinstallcheck_HSICEstimatorGlobalSensitivity_std ......................***Timeout 500.16 sec


99% tests passed, 1 tests failed out of 650

Total Test time (real) = 3335.63 sec

The following tests FAILED:
	1146 - pyinstallcheck_HSICEstimatorGlobalSensitivity_std (Timeout)
Errors while running CTest



Doubling the timeout in override_dh_auto_install from 500 to 1000 seconds
got me a successful build:

...
656/656 Test #1152: pyinstallcheck_HSICEstimatorGlobalSensitivity_std ......................   Passed  634.61 sec

100% tests passed, 0 tests failed out of 656
...

We believe that the bug you reported is fixed in the latest version of
openturns, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1141162@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Pierre Gruet <pgt@debian.org> (supplier of updated openturns package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Thu, 02 Jul 2026 21:30:13 +0200
Source: openturns
Architecture: source
Version: 1.27.1-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Pierre Gruet <pgt@debian.org>
Closes: 1141162
Changes:
 openturns (1.27.1-2) unstable; urgency=medium
 .
   * Raising test timeout from 500 to 1000 to solve build failure on riscv64,
     thanks to Adrian Bunk! (Closes: #1141162)
   * Forwarding patch
Checksums-Sha1:
 dc13d70ab978dbcb6e6179e3453405bb3f881fd0 2651 openturns_1.27.1-2.dsc
 e9ed9d5918b8a3c3f050ac174d8a2150bbfc05b0 28320 openturns_1.27.1-2.debian.tar.xz
 faa52bec28aa0192bd31cc1f0a590516bf7f5895 7996 openturns_1.27.1-2_source.buildinfo
Checksums-Sha256:
 1472600a00096aaec038ded5c9b6730376ac0a3f8c9eb2124b5e137a8ee47632 2651 openturns_1.27.1-2.dsc
 6eb6217015cf64c946b330961092353ad0972d6ddeda74789c12803e8e426835 28320 openturns_1.27.1-2.debian.tar.xz
 be418ba33be51ae3f2cf81f32fc0684d290749b7fd2523d9ad8d7e5f0cbd460f 7996 openturns_1.27.1-2_source.buildinfo
Files:
 e79dad7fa2cf2a0ec63a4355614c2b8c 2651 science optional openturns_1.27.1-2.dsc
 fc21905eaf09a3fae7e086b82a9f5e77 28320 science optional openturns_1.27.1-2.debian.tar.xz
 012edf57ccd5e7f6d566c836d01ffb55 7996 science optional openturns_1.27.1-2_source.buildinfo
-----BEGIN PGP SIGNATURE-----
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=2MUo
-----END PGP SIGNATURE-----