[Pyfltk-user] My 1.4.2 build issue

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Trying to install on Fedora 42. Just built and installed FLTK 1.4.2.

In my virtual environment, I try pip install pyfltk, which soon gives me this error:

      g++ -fno-strict-overflow -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DNDEBUG -fexceptions -fcf-protection -fexceptions -fcf-protection -fexceptions -fcf-protection -O3 -fPIC -DUNIX=1 -DFL_INTERNALS=1 -I/usr/include/sysprof-6 -I/usr/lib64/glib-2.0/include -I/usr/include/glib-2.0 -I/usr/include/harfbuzz -I/usr/include/libpng16 -I/usr/include/freetype2 -I/usr/include/libxml2 -I/usr/local/include/FL/images -I/usr/local/include -I./src -I./contrib -I/usr/include -I./plug-in/include -I./plug-in/src -I/home/paxton/MyStuff/source/pyfltk/tutorial1/venv/include -I/usr/include/python3.13 -c ./fltk/fltk_wrap.cpp -o build/temp.linux-x86_64-cpython-313/fltk/fltk_wrap.o -Wno-unused-label -Wno-unused-but-set-variable -Wformat=1 -Werror=format-security
      cc1plus: fatal error: ./fltk/fltk_wrap.cpp: No such file or directory
      compilation terminated.
      error: command '/usr/bin/g++' failed with exit code 1
      [end of output]

Any idea what I'm doing wrong?

gcc 15.0.1
Python 3.13.3

Thanks!