New compile failures with poppler 0.83.0, with the patch applied from https://bugs.kde.org/show_bug.cgi?id=414751:

/var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.cpp: In member function 'virtual void SvgOutputDev::stroke(GfxState*)':
/var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.cpp:144:46: error: invalid conversion from 'const GfxPath*' to 'GfxPath*' [-fpermissive]
  144 |     QString path = convertPath(state->getPath());
      |                                ~~~~~~~~~~~~~~^~
      |                                              |
      |                                              const GfxPath*
In file included from /var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.cpp:20:
/var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.h:86:34: note:   initializing argument 1 of 'QString SvgOutputDev::convertPath(GfxPath*)'
   86 |     QString convertPath(GfxPath *path);
      |                         ~~~~~~~~~^~~~
/var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.cpp: In member function 'virtual void SvgOutputDev::fill(GfxState*)':
/var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.cpp:155:46: error: invalid conversion from 'const GfxPath*' to 'GfxPath*' [-fpermissive]
  155 |     QString path = convertPath(state->getPath());
      |                                ~~~~~~~~~~~~~~^~
      |                                              |
      |                                              const GfxPath*
In file included from /var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.cpp:20:
/var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.h:86:34: note:   initializing argument 1 of 'QString SvgOutputDev::convertPath(GfxPath*)'
   86 |     QString convertPath(GfxPath *path);
      |                         ~~~~~~~~~^~~~
/var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.cpp: In member function 'virtual void SvgOutputDev::eoFill(GfxState*)':
/var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.cpp:166:46: error: invalid conversion from 'const GfxPath*' to 'GfxPath*' [-fpermissive]
  166 |     QString path = convertPath(state->getPath());
      |                                ~~~~~~~~~~~~~~^~
      |                                              |
      |                                              const GfxPath*
In file included from /var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.cpp:20:
/var/tmp/paludis/build/app-office-calligra-3.1.0-r3/work/calligra-3.1.0/filters/karbon/pdf/SvgOutputDev.h:86:34: note:   initializing argument 1 of 'QString SvgOutputDev::convertPath(GfxPath*)'
   86 |     QString convertPath(GfxPath *path);
      |                         ~~~~~~~~~^~~~

Complete build log attached.