Bug#1101945: gnuplot: FTBFS if qt6-base-dev is also installed

[Dima Kogan]

Source: gnuplot
Severity: normal
Tags: ftbfs

Hi. I just tried to build gnuplot. In addition to the Build-Depends I
also had qt6-base-dev installed. This happened:

   $ dpkg-buidpackage -us -uc -b

   ... lots of things building ...
   /usr/lib/qt6/bin/lrelease ../../../src/qtterminal/po/qtgnuplot_fr.ts -qm qtgnuplot_fr.qm
   make[5]: /usr/lib/qt6/bin/lrelease: No such file or directory

If we're trying to build against qt5, then the build system should do
that, and not inadvertently use any qt6 stuff that also happens to be
installed

Thanks

-- System Information:
Debian Release: trixie/sid
  APT prefers unstable
  APT policy: (800, 'unstable'), (700, 'testing'), (500, 'unstable-debug'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: arm64

Kernel: Linux 6.12.8-amd64 (SMP w/4 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.utf-8, LC_CTYPE=en_US.utf-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.utf-8), LANGUAGE=en_US.utf-8
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

-- no debconf information