I now reported the upstream bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=972551, which may or may not be the root of the reported failure.
smime.p7s
Description: S/MIME Cryptographic Signature
- Bug#972394: siconos: FTBFS could not find Python 3 Markus Koschany
- Bug#972394: got same error in other project Joachim Wuttke
- Bug#972394: got same error in other project Markus Koschany
- Bug#972394: likely cause: Python.h not found because... Joachim Wuttke
- Bug#972394: likely cause: Python.h not found because... Markus Koschany
- Bug#972394: likely cause: Python.h not found bec... Adrian Bunk
- Bug#972394: likely cause: Python.h not found... Stephen Sinclair
- Bug#972394: likely cause: Python.h not f... Adrian Bunk
- Bug#972394: upstream bug report Joachim Wuttke
