The no-dev option is deprecated.  Use -Wno-author instead.
CMake Warning (unused-cli):
  Manually-specified variables were not used by the project:

    CMAKE_LD_FLAGS
    ECM_MKSPECS_INSTALL_DIR


/var/pisi/kdegraphics-thumbnailers-26.08.1-79/work/kdegraphics-thumbnailers-26.08.1/ps/dscparse.cpp: In function ‘int dsc_fixup(CDSC*)’:
/var/pisi/kdegraphics-thumbnailers-26.08.1-79/work/kdegraphics-thumbnailers-26.08.1/ps/dscparse.cpp:513:27: warning: this statement may fall through [-Wimplicit-fallthrough=]
  513 |                 dsc->epsf = FALSE;
/var/pisi/kdegraphics-thumbnailers-26.08.1-79/work/kdegraphics-thumbnailers-26.08.1/ps/dscparse.cpp:514:13: note: here
  514 |             case CDSC_RESPONSE_IGNORE_ALL:
      |             ^~~~
/var/pisi/kdegraphics-thumbnailers-26.08.1-79/work/kdegraphics-thumbnailers-26.08.1/ps/gscreator.cpp: In member function ‘virtual KIO::ThumbnailResult GSCreator::create(const KIO::ThumbnailRequest&)’:
/var/pisi/kdegraphics-thumbnailers-26.08.1-79/work/kdegraphics-thumbnailers-26.08.1/ps/gscreator.cpp:331:11: warning: ignoring return value of ‘int pipe(int*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  331 |       pipe(dvipipe);
      |       ~~~~^~~~~~~~~
/var/pisi/kdegraphics-thumbnailers-26.08.1-79/work/kdegraphics-thumbnailers-26.08.1/ps/gscreator.cpp:389:12: warning: ignoring return value of ‘ssize_t write(int, const void*, size_t)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  389 |       write(input[1], translation, strlen(translation));
      |       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~