From: mitya57@debian.org   
      
   Hi Patrick!   
      
   On Sat, Feb 14, 2026 at 01:36:09PM +0100, Patrick Franz wrote:   
   > Source: pyqt6   
   > Version: 6.10.2-1   
   > Severity: important   
   > Tags: ftbfs   
   > X-Debbugs-Cc: deltaone@debian.org   
   >    
   > Dear maintainer,   
   >    
   > we are currently preparing Qt 6.10.2 in experimental and your package FTBFS   
   against it.   
   >    
   > The hopefully relevant part of the build log:   
   >    
   > ---   
   > I: pybuild base:384: python3.14 /usr/bin/sip-build --verbose --no-make   
   --confirm-license --pep484-pyi --target-dir /usr/lib/python3/dist-packages   
   --build-dir /build/package/package/.pybuild/cpython3_3.14/build --qmake   
   /usr/lib/qt6/bin/qmake --qmake-   
   setting 'CONFIG += nostrip' --qmake-setting 'QMAKE_CXXFLAGS += "-g -O2   
   -ffile-prefix-map=/build/package/package=. -fstack-protector-strong   
   -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection   
   -Wdate-time -D_FORTIFY_SOURCE=2"' --qmake-   
   setting 'QMAKE_LFLAGS += "-Wl,-z,relro"'   
   > Querying qmake about your Qt installation...   
   > /usr/lib/qt6/bin/qmake -query   
   > This is the GPL version of PyQt 6.10.2 (licensed under the GNU General   
   Public License) for Python 3.14.3 on linux.   
   > Found the license file 'pyqt-gpl.sip'.   
   > Checking to see if the QtCore bindings can be built...   
   > /usr/lib/qt6/bin/qmake QtCore.pro   
   > Info: creating stash file /build/package/package/.pybuild/cpyt   
   on3_3.14/build/cfgtest_QtCore/.qmake.stash   
   > Project ERROR: Library 'libatomic' is not defined.   
      
   This problem is caused by qt_lib_core_private.pri being moved to   
   qt6-base-private-dev. However this breaks build of qmake projects that do   
   not use anything private, when that package is not installed. Here is a very   
   minimal example:   
      
       # cat test.pro   
       QT -= gui   
       SOURCES = test.cpp   
      
       # cat test.cpp   
       int main() {   
           return 0;   
       }   
      
       # qmake6   
       Project ERROR: Library 'libatomic' is not defined.   
      
   QMAKE_LIBS_LIBATOMIC is defined in qt_lib_core_private.pri, but it is used   
   by qt_lib_core.pri which is public.   
      
   Is it possible to reconsider that change, or I should build-depend on   
   qt6-base-private-dev?   
      
   --   
   Dmitry Shachnev   
      
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