Enable CPack support to build binary packages and installers

This minimal implementation works and enables basic (mostly default)
CPack support to build binary packages of FLTK (RPM, TGZ, NSIS, ...).

Users need the required tools like `rpmbuild` to build a particular
type of package or installer.

Using EPM or rpmbuild directly with a provided "list" file has
been discontinued: fltk.list.in (EPM) and fltk.spec.in (RPM) have
consequently been deleted.

README.CPack.txt: basic documentation

5 files changed, 143 insertions, 577 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ea0b37067..aeec6dfa8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -350,6 +350,18 @@ if(FLTK_BUILD_SHARED_LIBS AND GENERATE_EXPORT_HEADERS)
 endif(FLTK_BUILD_SHARED_LIBS AND GENERATE_EXPORT_HEADERS)
 
 #######################################################################
+# Configure CPack only if this is the top level project.
+# The logic may be extended if including CPack is made optional.
+# Currently it is included unconditionally for testing purposes.
+#######################################################################
+
+if(FLTK_IS_TOPLEVEL)
+
+  add_subdirectory(package)
+
+endif()
+
+#######################################################################
 # Output Build Configuration Summary
 #######################################################################
 
diff --git a/README.CPack.txt b/README.CPack.txt
new file mode 100644
index 000000000..e9f11dd85
--- /dev/null
+++ b/README.CPack.txt
@@ -0,0 +1,83 @@
+README.CPack.txt - Building Binary Packages with CPack
+-------------------------------------------------------
+
+Intended Audience
+-----------------
+
+"Packagers" (maintainers) of Linux distributions or users who want to
+deploy FLTK binary packages on multiple systems, e.g. companies using
+FLTK for their software development.
+
+
+Introduction
+------------
+
+In previous FLTK versions binary packages could be created using EPM
+(an external tool) or `rpmbuild` on Linux. Both tools used files no
+longer provided by FLTK: 'fltk.list' (EPM) and 'fltk.spec' (RPM).
+
+FLTK 1.5 and later supports CPack to create binary "packages". The new
+approach using CPack is more flexible and supports many more package
+formats. CPack is usually installed together with CMake.
+
+CPack support is still experimental and may be improved in the future.
+The documentation below may be enhanced later if required.
+
+
+How To Build Binary Packages
+----------------------------
+
+On some platforms and with some "generators" CMake creates the target
+'package' so you can execute e.g. `make package` after building FLTK.
+This creates the default set of packages for the given platform.
+
+On other platforms, or to use more flexible options, `cpack` may be run
+from the commandline after building FLTK to generate a particular package
+format. For details please refer to the CMake and CPack documentation.
+
+
+Example Commands On Linux Using Ninja
+-------------------------------------
+
+1. Build the FLTK library:
+
+$ cd /path-to-fltk
+$ cmake -G Ninja -D CMAKE_BUILD_TYPE=Release -B build
+$ cmake --build build
+
+2. Create one or more binary packages:
+
+$ cmake --build build --target package
+
+... or ...
+
+$ cd build
+$ ninja package  # or `make package` if you're using Makefiles
+
+... or to build (only) the RPM package:
+
+$ cpack -G RPM
+
+... or to build a .tar.gz package:
+
+$ cpack -G TGZ
+
+See `cpack --help` for possible package formats ("Generators").
+
+Note: you need to install the package format specific tools on your system
+to create some package formats, e.g. `rpmbuild` for RPM packages.
+
+
+Further Reading
+---------------
+
+More information on this topic can be found in the CMake and CPack
+documentation or by executing `cpack --help`.
+
+
+Links: To Documentation
+-----------------------
+
+https://cmake.org/cmake/help/latest/index.html
+https://cmake.org/cmake/help/latest/manual/cmake.1.html
+https://cmake.org/cmake/help/latest/manual/cpack.1.html
diff --git a/fltk.list.in b/fltk.list.in
deleted file mode 100644
index bfa2f3e52..000000000
--- a/fltk.list.in
+++ /dev/null
@@ -1,446 +0,0 @@
-#
-# EPM product list file for the Fast Light Tool Kit (FLTK).
-#
-# (EPM can be found at https://www.msweet.org/epm/)
-#
-# Copyright 1998-2023 by Bill Spitzak and others.
-#
-# This library is free software. Distribution and use rights are outlined in
-# the file "COPYING" which should have been included with this file.  If this
-# file is missing or damaged, see the license at:
-#
-#      https://www.fltk.org/COPYING.php
-#
-# Please see the following page on how to report bugs and issues:
-#
-#      https://www.fltk.org/bugs.php
-#
-
-%product Fast Light Tool Kit (FLTK)
-%copyright 1998-2023 by Bill Spitzak and others.
-%vendor FLTK Development Team
-%license COPYING
-%readme README.txt
-%version @FLTK_VERSION@
-%description The Fast Light Tool Kit ("FLTK") is a cross-platform C++ GUI
-%description toolkit for UNIX(r)/Linux(r) (X11), Microsoft(r) Windows(r),
-%description and macOS(r).  FLTK provides modern GUI functionality without
-%description bloat and supports 3D graphics via OpenGL(r) and its built-in
-%description GLUT emulation.
-
-$prefix=@prefix@
-$exec_prefix=@exec_prefix@
-$bindir=@bindir@
-$datarootdir=@datarootdir@
-$datadir=@datadir@
-$includedir=@includedir@
-$libdir=@libdir@
-$mandir=@mandir@
-$docdir=${datadir}/doc/fltk
-
-$CAT1EXT=@CAT1EXT@
-$CAT3EXT=@CAT3EXT@
-$CAT6EXT=@CAT6EXT@
-
-$DSONAME=@DSONAME@
-$FLDSONAME=@FLDSONAME@
-$FLLIBNAME=@FLLIBNAME@
-$GLDSONAME=@GLDSONAME@
-$GLLIBNAME=@GLLIBNAME@
-$FLUID=@FLUID@
-$FLTK_OPTIONS=@FLTK_OPTIONS@
-$JPEG=@JPEG@
-$PNG=@PNG@
-$ZLIB=@ZLIB@
-
-%if DSONAME
-%system aix
-f 0555 root sys $libdir/libfltk_s.a src/libfltk_s.a nostrip()
-%system hpux
-f 0555 root sys $libdir/libfltk.sl.@FL_DSO_VERSION@ src/libfltk.sl.@FL_DSO_VERSION@ nostrip()
-%system darwin
-f 0555 root sys $libdir/libfltk.@FL_DSO_VERSION@.dylib src/libfltk.@FL_DSO_VERSION@.dylib nostrip()
-%system !aix !darwin !hpux
-f 0555 root sys $libdir/libfltk.so.@FL_DSO_VERSION@ src/libfltk.so.@FL_DSO_VERSION@ nostrip()
-%system all
-
-%system aix
-f 0555 root sys $libdir/libfltk_forms_s.a src/libfltk_forms_s.a nostrip()
-%system hpux
-f 0555 root sys $libdir/libfltk_forms.sl.@FL_DSO_VERSION@ src/libfltk_forms.sl.@FL_DSO_VERSION@ nostrip()
-%system darwin
-f 0555 root sys $libdir/libfltk_forms.@FL_DSO_VERSION@.dylib src/libfltk_forms.@FL_DSO_VERSION@.dylib nostrip()
-%system !aix !darwin !hpux
-f 0555 root sys $libdir/libfltk_forms.so.@FL_DSO_VERSION@ src/libfltk_forms.so.@FL_DSO_VERSION@ nostrip()
-%system all
-
-%system aix
-f 0555 root sys $libdir/libfltk_images_s.a src/libfltk_images_s.a nostrip()
-%system hpux
-f 0555 root sys $libdir/libfltk_images.sl.@FL_DSO_VERSION@ src/libfltk_images.sl.@FL_DSO_VERSION@ nostrip()
-%system darwin
-f 0555 root sys $libdir/libfltk_images.@FL_DSO_VERSION@.dylib src/libfltk_images.@FL_DSO_VERSION@.dylib nostrip()
-%system !aix !darwin !hpux
-f 0555 root sys $libdir/libfltk_images.so.@FL_DSO_VERSION@ src/libfltk_images.so.@FL_DSO_VERSION@ nostrip()
-%system all
-%endif
-
-%if GLDSONAME
-%system aix
-f 0555 root sys $libdir/libfltk_gl_s.a src/libfltk_gl_s.a nostrip()
-%system hpux
-f 0555 root sys $libdir/libfltk_gl.sl.@FL_DSO_VERSION@ src/libfltk_gl.sl.@FL_DSO_VERSION@ nostrip()
-%system darwin
-f 0555 root sys $libdir/libfltk_gl.@FL_DSO_VERSION@.dylib src/libfltk_gl.@FL_DSO_VERSION@.dylib nostrip()
-%system !aix !darwin !hpux
-f 0555 root sys $libdir/libfltk_gl.so.@FL_DSO_VERSION@ src/libfltk_gl.so.@FL_DSO_VERSION@ nostrip()
-%system all
-%endif
-
-
-%subpackage devel
-%description FLTK Development Environment
-%description Install fltk-devel if you need to develop FLTK applications.
-%description You'll need to install the fltk package if you plan to run
-%description dynamically linked applications.
-
-%system darwin
-d 0555 root sys /Applications/fluid.app -
-d 0555 root sys /Applications/fluid.app/Contents -
-f 0444 root sys /Applications/fluid.app/Contents/Info.plist fluid/fluid.app/Contents/Info.plist
-d 0555 root sys /Applications/fluid.app/Contents/MacOS -
-l 0555 root sys /Applications/fluid.app/Contents/MacOS/fluid $bindir/fluid
-d 0555 root sys /Applications/fluid.app/Contents/Resources -
-f 0444 root sys /Applications/fluid.app/Contents/Resources/fluid.icns fluid/fluid.app/Contents/Resources/fluid.icns
-%postinstall $bindir/fltk-config --post $bindir/fluid
-%postremove /bin/rm -rf /Applications/fluid.app
-
-d 0555 root sys /Applications/fltk-options.app -
-d 0555 root sys /Applications/fltk-options.app/Contents -
-f 0444 root sys /Applications/fltk-options.app/Contents/Info.plist fltk-options/fltk-options.app/Contents/Info.plist
-d 0555 root sys /Applications/fltk-options.app/Contents/MacOS -
-l 0555 root sys /Applications/fltk-options.app/Contents/MacOS/fltk-options $bindir/fltk-options
-d 0555 root sys /Applications/fltk-options.app/Contents/Resources -
-f 0444 root sys /Applications/fltk-options.app/Contents/Resources/fltk-options.icns fltk-options/fltk-options.app/Contents/Resources/fltk-options.icns
-%postinstall $bindir/fltk-config --post $bindir/fltk-options
-%postremove /bin/rm -rf /Applications/fltk-options.app
-
-%system !darwin
-f 0444 root sys /usr/share/applications/fluid.desktop fluid/fluid.desktop
-f 0444 root sys /usr/share/icons/hicolor/16x16/apps/fluid.png fluid/icons/fluid-16.png
-f 0444 root sys /usr/share/icons/hicolor/32x32/apps/fluid.png fluid/icons/fluid-32.png
-f 0444 root sys /usr/share/icons/hicolor/48x48/apps/fluid.png fluid/icons/fluid-48.png
-f 0444 root sys /usr/share/icons/hicolor/64x64/apps/fluid.png fluid/icons/fluid-64.png
-f 0444 root sys /usr/share/icons/hicolor/128x128/apps/fluid.png fluid/icons/fluid-128.png
-f 0444 root sys /usr/share/mimelnk/application/x-fluid.desktop fluid/fluid.desktop
-
-f 0444 root sys /usr/share/applications/fltk-options.desktop fltk-options/fltk-options.desktop
-f 0444 root sys /usr/share/icons/hicolor/16x16/apps/fltk-options.png fltk-options/icons/fltk-options-16.png
-f 0444 root sys /usr/share/icons/hicolor/32x32/apps/fltk-options.png fltk-options/icons/fltk-options-32.png
-f 0444 root sys /usr/share/icons/hicolor/48x48/apps/fltk-options.png fltk-options/icons/fltk-options-48.png
-f 0444 root sys /usr/share/icons/hicolor/64x64/apps/fltk-options.png fltk-options/icons/fltk-options-64.png
-f 0444 root sys /usr/share/icons/hicolor/128x128/apps/fltk-options.png fltk-options/icons/fltk-options-128.png
-f 0444 root sys /usr/share/mimelnk/application/x-fltk-options.desktop fltk-options/fltk-options.desktop
-
-%system all
-
-# Applications
-f 0555 root sys $bindir/fluid fluid/$FLUID
-f 0555 root sys $bindir/fltk-options fltk-options/$FLTK_OPTIONS
-f 0555 root sys $bindir/fltk-config fltk-config
-
-# Man pages
-f 0444 root sys $mandir/cat1/fluid.$CAT1EXT documentation/src/fluid.$CAT1EXT
-f 0444 root sys $mandir/cat1/fltk-options.$CAT1EXT documentation/src/fltk-options.$CAT1EXT
-f 0444 root sys $mandir/cat1/fltk-config.$CAT1EXT documentation/src/fltk-config.$CAT1EXT
-f 0444 root sys $mandir/cat3/fltk.$CAT3EXT documentation/src/fltk.$CAT3EXT
-f 0444 root sys $mandir/man1/fluid.1 documentation/src/fluid.man
-f 0444 root sys $mandir/man1/fltk-options.1 documentation/src/fltk-options.man
-f 0444 root sys $mandir/man1/fltk-config.1 documentation/src/fltk-config.man
-f 0444 root sys $mandir/man3/fltk.3 documentation/src/fltk.man
-
-# Library files
-f 0444 root sys $libdir/libfltk.a lib/libfltk.a
-f 0444 root sys $libdir/libfltk_forms.a lib/libfltk_forms.a
-f 0444 root sys $libdir/libfltk_images.a lib/libfltk_images.a
-%if GLLIBNAME
-f 0444 root sys $libdir/libfltk_gl.a lib/libfltk_gl.a
-%endif
-
-%if JPEG
-f 0444 root sys $libdir/libfltk_jpeg.a lib/libfltk_jpeg.a
-%endif
-
-%if PNG
-f 0444 root sys $libdir/libfltk_png.a lib/libfltk_png.a
-%endif
-
-%if ZLIB
-f 0444 root sys $libdir/libfltk_z.a lib/libfltk_z.a
-%endif
-
-%if DSONAME
-%system hpux
-l 0000 root sys $libdir/libfltk.sl libfltk.sl.@FL_DSO_VERSION@
-%system darwin
-l 0000 root sys $libdir/libfltk.dylib libfltk.@FL_DSO_VERSION@.dylib
-%system !aix !darwin !hpux
-l 0000 root sys $libdir/libfltk.so libfltk.so.@FL_DSO_VERSION@
-%system all
-
-%system hpux
-l 0000 root sys $libdir/libfltk_forms.sl libfltk_forms.sl.@FL_DSO_VERSION@
-%system darwin
-l 0000 root sys $libdir/libfltk_forms.dylib libfltk_forms.@FL_DSO_VERSION@.dylib
-%system !aix !darwin !hpux
-l 0000 root sys $libdir/libfltk_forms.so libfltk_forms.so.@FL_DSO_VERSION@
-%system all
-
-%system hpux
-l 0000 root sys $libdir/libfltk_images.sl libfltk_images.sl.@FL_DSO_VERSION@
-%system darwin
-l 0000 root sys $libdir/libfltk_images.dylib libfltk_images.@FL_DSO_VERSION@.dylib
-%system !aix !darwin !hpux
-l 0000 root sys $libdir/libfltk_images.so libfltk_images.so.@FL_DSO_VERSION@
-%system all
-%endif
-
-%if GLDSONAME
-%system hpux
-l 0000 root sys $libdir/libfltk_gl.sl libfltk_gl.sl.@FL_DSO_VERSION@
-%system darwin
-l 0000 root sys $libdir/libfltk_gl.dylib libfltk_gl.@FL_DSO_VERSION@.dylib
-%system !aix !darwin !hpux
-l 0000 root sys $libdir/libfltk_gl.so libfltk_gl.so.@FL_DSO_VERSION@
-%system all
-%endif
-
-# Header files
-f 0444 root sys $includedir/FL/ FL/*.[hH]
-
-%if JPEG
-f 0444 root sys $includedir/FL/images/jconfig.h jpeg/jconfig.h
-f 0444 root sys $includedir/FL/images/jerror.h jpeg/jerror.h
-f 0444 root sys $includedir/FL/images/jmorecfg.h jpeg/jmorecfg.h
-f 0444 root sys $includedir/FL/images/jpeglib.h jpeg/jpeglib.h
-%endif
-
-%if PNG
-f 0444 root sys $includedir/FL/images/png.h png/png.h
-f 0444 root sys $includedir/FL/images/pngconf.h png/pngconf.h
-f 0444 root sys $includedir/FL/images/pnglibconf.h png/pnglibconf.h
-%endif
-
-%if ZLIB
-f 0444 root sys $includedir/FL/images/zconf.h zlib/zconf.h
-f 0444 root sys $includedir/FL/images/zlib.h zlib/zlib.h
-f 0444 root sys $includedir/FL/images/zutil.h zlib/zutil.h
-%endif
-
-%system !darwin
-# Symlinks to handle common case problems...
-l 0000 root sys $includedir/Fl FL
-l 0000 root sys $includedir/FL/Enumerations.h Enumerations.H
-l 0000 root sys $includedir/FL/Fl.h Fl.H
-l 0000 root sys $includedir/FL/Fl_Adjuster.h Fl_Adjuster.H
-l 0000 root sys $includedir/FL/Fl_Bitmap.h Fl_Bitmap.H
-l 0000 root sys $includedir/FL/Fl_BMP_Image.h Fl_BMP_Image.H
-l 0000 root sys $includedir/FL/Fl_Box.h Fl_Box.H
-l 0000 root sys $includedir/FL/Fl_Browser.h Fl_Browser.H
-l 0000 root sys $includedir/FL/Fl_Browser_.h Fl_Browser_.H
-l 0000 root sys $includedir/FL/Fl_Button.h Fl_Button.H
-l 0000 root sys $includedir/FL/Fl_Cairo.h Fl_Cairo.H
-l 0000 root sys $includedir/FL/Fl_Cairo_Window.h Fl_Cairo_Window.H
-l 0000 root sys $includedir/FL/Fl_Chart.h Fl_Chart.H
-l 0000 root sys $includedir/FL/Fl_Check_Browser.h Fl_Check_Browser.H
-l 0000 root sys $includedir/FL/Fl_Check_Button.h Fl_Check_Button.H
-l 0000 root sys $includedir/FL/Fl_Choice.h Fl_Choice.H
-l 0000 root sys $includedir/FL/Fl_Clock.h Fl_Clock.H
-l 0000 root sys $includedir/FL/Fl_Color_Chooser.h Fl_Color_Chooser.H
-l 0000 root sys $includedir/FL/Fl_Counter.h Fl_Counter.H
-l 0000 root sys $includedir/FL/Fl_Device.h Fl_Device.H
-l 0000 root sys $includedir/FL/Fl_Dial.h Fl_Dial.H
-l 0000 root sys $includedir/FL/Fl_Double_Window.h Fl_Double_Window.H
-l 0000 root sys $includedir/FL/Fl_Export.h Fl_Export.H
-l 0000 root sys $includedir/FL/Fl_File_Browser.h Fl_File_Browser.H
-l 0000 root sys $includedir/FL/Fl_File_Chooser.h Fl_File_Chooser.H
-l 0000 root sys $includedir/FL/Fl_File_Icon.h Fl_File_Icon.H
-l 0000 root sys $includedir/FL/Fl_Fill_Dial.h Fl_Fill_Dial.H
-l 0000 root sys $includedir/FL/Fl_Fill_Slider.h Fl_Fill_Slider.H
-l 0000 root sys $includedir/FL/Fl_Float_Input.h Fl_Float_Input.H
-l 0000 root sys $includedir/FL/Fl_FormsBitmap.h Fl_FormsBitmap.H
-l 0000 root sys $includedir/FL/Fl_FormsPixmap.h Fl_FormsPixmap.H
-l 0000 root sys $includedir/FL/Fl_Free.h Fl_Free.H
-l 0000 root sys $includedir/FL/Fl_GIF_Image.h Fl_GIF_Image.H
-l 0000 root sys $includedir/FL/Fl_Gl_Window.h Fl_Gl_Window.H
-l 0000 root sys $includedir/FL/Fl_Group.h Fl_Group.H
-l 0000 root sys $includedir/FL/Fl_Help_Dialog.h Fl_Help_Dialog.H
-l 0000 root sys $includedir/FL/Fl_Help_View.h Fl_Help_View.H
-l 0000 root sys $includedir/FL/Fl_Hold_Browser.h Fl_Hold_Browser.H
-l 0000 root sys $includedir/FL/Fl_Hor_Fill_Slider.h Fl_Hor_Fill_Slider.H
-l 0000 root sys $includedir/FL/Fl_Hor_Nice_Slider.h Fl_Hor_Nice_Slider.H
-l 0000 root sys $includedir/FL/Fl_Hor_Slider.h Fl_Hor_Slider.H
-l 0000 root sys $includedir/FL/Fl_Hor_Value_Slider.h Fl_Hor_Value_Slider.H
-l 0000 root sys $includedir/FL/Fl_Image.h Fl_Image.H
-l 0000 root sys $includedir/FL/Fl_JPEG_Image.h Fl_JPEG_Image.H
-l 0000 root sys $includedir/FL/Fl_Input.h Fl_Input.H
-l 0000 root sys $includedir/FL/Fl_Input_.h Fl_Input_.H
-l 0000 root sys $includedir/FL/Fl_Input_Choice.h Fl_Input_Choice.H
-l 0000 root sys $includedir/FL/Fl_Int_Input.h Fl_Int_Input.H
-l 0000 root sys $includedir/FL/Fl_Light_Button.h Fl_Light_Button.H
-l 0000 root sys $includedir/FL/Fl_Line_Dial.h Fl_Line_Dial.H
-l 0000 root sys $includedir/FL/Fl_Menu.h Fl_Menu.H
-l 0000 root sys $includedir/FL/Fl_Menu_.h Fl_Menu_.H
-l 0000 root sys $includedir/FL/Fl_Menu_Bar.h Fl_Menu_Bar.H
-l 0000 root sys $includedir/FL/Fl_Menu_Button.h Fl_Menu_Button.H
-l 0000 root sys $includedir/FL/Fl_Menu_Item.h Fl_Menu_Item.H
-l 0000 root sys $includedir/FL/Fl_Menu_Window.h Fl_Menu_Window.H
-l 0000 root sys $includedir/FL/Fl_Multi_Browser.h Fl_Multi_Browser.H
-l 0000 root sys $includedir/FL/Fl_Multi_Label.h Fl_Multi_Label.H
-l 0000 root sys $includedir/FL/Fl_Multiline_Input.h Fl_Multiline_Input.H
-l 0000 root sys $includedir/FL/Fl_Multiline_Output.h Fl_Multiline_Output.H
-l 0000 root sys $includedir/FL/Fl_Native_File_Chooser.h Fl_Native_File_Chooser.H
-l 0000 root sys $includedir/FL/Fl_Nice_Slider.h Fl_Nice_Slider.H
-l 0000 root sys $includedir/FL/Fl_Object.h Fl_Object.H
-l 0000 root sys $includedir/FL/Fl_Output.h Fl_Output.H
-l 0000 root sys $includedir/FL/Fl_Overlay_Window.h Fl_Overlay_Window.H
-l 0000 root sys $includedir/FL/Fl_Pack.h Fl_Pack.H
-l 0000 root sys $includedir/FL/Fl_Paged_Device.h Fl_Paged_Device.H
-l 0000 root sys $includedir/FL/Fl_Pixmap.h Fl_Pixmap.H
-l 0000 root sys $includedir/FL/Fl_Plugin.h Fl_Plugin.H
-l 0000 root sys $includedir/FL/Fl_PNG_Image.h Fl_PNG_Image.H
-l 0000 root sys $includedir/FL/Fl_PNM_Image.h Fl_PNM_Image.H
-l 0000 root sys $includedir/FL/Fl_Positioner.h Fl_Positioner.H
-l 0000 root sys $includedir/FL/Fl_PostScript.h Fl_PostScript.H
-l 0000 root sys $includedir/FL/Fl_Preferences.h Fl_Preferences.H
-l 0000 root sys $includedir/FL/Fl_Printer.h Fl_Printer.H
-l 0000 root sys $includedir/FL/Fl_Progress.h Fl_Progress.H
-l 0000 root sys $includedir/FL/Fl_Radio_Button.h Fl_Radio_Button.H
-l 0000 root sys $includedir/FL/Fl_Radio_Light_Button.h Fl_Radio_Light_Button.H
-l 0000 root sys $includedir/FL/Fl_Radio_Round_Button.h Fl_Radio_Round_Button.H
-l 0000 root sys $includedir/FL/Fl_Repeat_Button.h Fl_Repeat_Button.H
-l 0000 root sys $includedir/FL/Fl_Return_Button.h Fl_Return_Button.H
-l 0000 root sys $includedir/FL/Fl_Roller.h Fl_Roller.H
-l 0000 root sys $includedir/FL/Fl_Round_Button.h Fl_Round_Button.H
-l 0000 root sys $includedir/FL/Fl_Round_Clock.h Fl_Round_Clock.H
-l 0000 root sys $includedir/FL/Fl_Scroll.h Fl_Scroll.H
-l 0000 root sys $includedir/FL/Fl_Scrollbar.h Fl_Scrollbar.H
-l 0000 root sys $includedir/FL/Fl_Secret_Input.h Fl_Secret_Input.H
-l 0000 root sys $includedir/FL/Fl_Select_Browser.h Fl_Select_Browser.H
-l 0000 root sys $includedir/FL/Fl_Shared_Image.h Fl_Shared_Image.H
-l 0000 root sys $includedir/FL/Fl_Simple_Counter.h Fl_Simple_Counter.H
-l 0000 root sys $includedir/FL/Fl_Single_Window.h Fl_Single_Window.H
-l 0000 root sys $includedir/FL/Fl_Slider.h Fl_Slider.H
-l 0000 root sys $includedir/FL/Fl_Spinner.h Fl_Spinner.H
-l 0000 root sys $includedir/FL/Fl_Sys_Menu_Bar.h Fl_Sys_Menu_Bar.H
-l 0000 root sys $includedir/FL/Fl_Table.h Fl_Table.H
-l 0000 root sys $includedir/FL/Fl_Table_Row.h Fl_Table_Row.H
-l 0000 root sys $includedir/FL/Fl_Tabs.h Fl_Tabs.H
-l 0000 root sys $includedir/FL/Fl_Text_Buffer.h Fl_Text_Buffer.H
-l 0000 root sys $includedir/FL/Fl_Text_Display.h Fl_Text_Display.H
-l 0000 root sys $includedir/FL/Fl_Text_Editor.h Fl_Text_Editor.H
-l 0000 root sys $includedir/FL/Fl_Tile.h Fl_Tile.H
-l 0000 root sys $includedir/FL/Fl_Tiled_Image.h Fl_Tiled_Image.H
-l 0000 root sys $includedir/FL/Fl_Timer.h Fl_Timer.H
-l 0000 root sys $includedir/FL/Fl_Toggle_Button.h Fl_Toggle_Button.H
-l 0000 root sys $includedir/FL/Fl_Toggle_Light_Button.h Fl_Toggle_Light_Button.H
-l 0000 root sys $includedir/FL/Fl_Toggle_Round_Button.h Fl_Toggle_Round_Button.H
-l 0000 root sys $includedir/FL/Fl_Tooltip.h Fl_Tooltip.H
-l 0000 root sys $includedir/FL/Fl_Tree.h Fl_Tree.H
-l 0000 root sys $includedir/FL/Fl_Tree_Item.h Fl_Tree_Item.H
-l 0000 root sys $includedir/FL/Fl_Tree_Item_Array.h Fl_Tree_Item_Array.H
-l 0000 root sys $includedir/FL/Fl_Tree_Prefs.h Fl_Tree_Prefs.H
-l 0000 root sys $includedir/FL/Fl_Valuator.h Fl_Valuator.H
-l 0000 root sys $includedir/FL/Fl_Value_Input.h Fl_Value_Input.H
-l 0000 root sys $includedir/FL/Fl_Value_Output.h Fl_Value_Output.H
-l 0000 root sys $includedir/FL/Fl_Value_Slider.h Fl_Value_Slider.H
-l 0000 root sys $includedir/FL/Fl_Widget.h Fl_Widget.H
-l 0000 root sys $includedir/FL/Fl_Window.h Fl_Window.H
-l 0000 root sys $includedir/FL/Fl_Wizard.h Fl_Wizard.H
-l 0000 root sys $includedir/FL/Fl_XBM_Image.h Fl_XBM_Image.H
-l 0000 root sys $includedir/FL/Fl_XPM_Image.h Fl_XPM_Image.H
-l 0000 root sys $includedir/FL/filename.h filename.H
-l 0000 root sys $includedir/FL/fl_ask.h fl_ask.H
-l 0000 root sys $includedir/FL/fl_draw.h fl_draw.H
-l 0000 root sys $includedir/FL/fl_message.h fl_message.H
-l 0000 root sys $includedir/FL/fl_show_colormap.h fl_show_colormap.H
-l 0000 root sys $includedir/FL/fl_show_input.h fl_show_input.H
-l 0000 root sys $includedir/FL/forms.h forms.H
-l 0000 root sys $includedir/FL/gl_draw.h gl_draw.H
-l 0000 root sys $includedir/FL/glut.h glut.H
-l 0000 root sys $includedir/FL/mac.h mac.H
-l 0000 root sys $includedir/FL/platform.h platform.H
-l 0000 root sys $includedir/FL/win32.h win32.H
-l 0000 root sys $includedir/FL/x.h x.H
-%system all
-
-# Documentation
-d 0555 root sys $docdir -
-f 0444 root sys $docdir/ documentation/html/*.gif
-f 0444 root sys $docdir/ documentation/html/*.html
-f 0444 root sys $docdir/ documentation/html/*.jpg
-f 0444 root sys $docdir/COPYING COPYING
-f 0444 root sys $docdir/CHANGES.txt CHANGES.txt
-
-# Examples
-d 0555 root sys $docdir/examples
-f 0444 root sys $docdir/examples/config.h config.h
-f 0444 root sys $docdir/examples/ test/*.cxx
-f 0444 root sys $docdir/examples/ test/*.fl
-f 0444 root sys $docdir/examples/ test/*.h
-
-%subpackage games
-%description FLTK Games
-%description Install fltk-games to play Block Attack!, checkers, or Sudoku on your computer.
-
-%system darwin
-d 0555 root sys /Applications/blocks.app -
-d 0555 root sys /Applications/blocks.app/Contents -
-f 0444 root sys /Applications/blocks.app/Contents/Info.plist test/blocks.app/Contents/Info.plist
-d 0555 root sys /Applications/blocks.app/Contents/MacOS -
-f 0555 root sys /Applications/blocks.app/Contents/MacOS/blocks test/blocks
-d 0555 root sys /Applications/blocks.app/Contents/Resources -
-f 0444 root sys /Applications/blocks.app/Contents/Resources/blocks.icns test/blocks.app/Contents/Resources/blocks.icns
-%postremove /bin/rm -rf /Applications/blocks.app
-
-d 0555 root sys /Applications/checkers.app -
-d 0555 root sys /Applications/checkers.app/Contents -
-f 0444 root sys /Applications/checkers.app/Contents/Info.plist test/checkers.app/Contents/Info.plist
-d 0555 root sys /Applications/checkers.app/Contents/MacOS -
-f 0555 root sys /Applications/checkers.app/Contents/MacOS/checkers test/checkers
-d 0555 root sys /Applications/checkers.app/Contents/Resources -
-f 0444 root sys /Applications/checkers.app/Contents/Resources/checkers.icns test/checkers.app/Contents/Resources/checkers.icns
-%postremove /bin/rm -rf /Applications/checkers.app
-
-d 0555 root sys /Applications/sudoku.app -
-d 0555 root sys /Applications/sudoku.app/Contents -
-f 0444 root sys /Applications/sudoku.app/Contents/Info.plist test/sudoku.app/Contents/Info.plist
-d 0555 root sys /Applications/sudoku.app/Contents/MacOS -
-f 0555 root sys /Applications/sudoku.app/Contents/MacOS/sudoku test/sudoku
-d 0555 root sys /Applications/sudoku.app/Contents/Resources -
-f 0444 root sys /Applications/sudoku.app/Contents/Resources/sudoku.icns test/sudoku.app/Contents/Resources/sudoku.icns
-%postremove /bin/rm -rf /Applications/sudoku.app
-
-%system !darwin
-f 0555 root sys $bindir/blocks test/blocks
-f 0444 root sys /usr/share/applications/blocks.desktop test/desktop/blocks.desktop
-f 0444 root sys /usr/share/icons/hicolor/32x32/apps/blocks.png test/desktop/blocks-32.png
-f 0444 root sys /usr/share/icons/hicolor/128x128/apps/blocks.png test/desktop/blocks-128.png
-
-f 0555 root sys $bindir/checkers test/checkers
-f 0444 root sys /usr/share/applications/checkers.desktop test/desktop/checkers.desktop
-f 0444 root sys /usr/share/icons/hicolor/32x32/apps/checkers.png test/desktop/checkers-32.png
-f 0444 root sys /usr/share/icons/hicolor/128x128/apps/checkers.png test/desktop/checkers-128.png
-
-f 0555 root sys $bindir/sudoku test/sudoku
-f 0444 root sys /usr/share/applications/sudoku.desktop test/desktop/sudoku.desktop
-f 0444 root sys /usr/share/icons/hicolor/32x32/apps/sudoku.png test/desktop/sudoku-32.png
-f 0444 root sys /usr/share/icons/hicolor/128x128/apps/sudoku.png test/desktop/sudoku-128.png
-
-%system all
-f 0444 root sys $mandir/cat6/blocks.$CAT6EXT documentation/src/blocks.$CAT6EXT
-f 0444 root sys $mandir/cat6/checkers.$CAT6EXT documentation/src/checkers.$CAT6EXT
-f 0444 root sys $mandir/cat6/sudoku.$CAT6EXT documentation/src/sudoku.$CAT6EXT
-f 0444 root sys $mandir/man6/blocks.6 documentation/src/blocks.man
-f 0444 root sys $mandir/man6/checkers.6 documentation/src/checkers.man
-f 0444 root sys $mandir/man6/sudoku.6 documentation/src/sudoku.man
diff --git a/fltk.spec.in b/fltk.spec.in
deleted file mode 100644
index 7b8a990a4..000000000
--- a/fltk.spec.in
+++ /dev/null
@@ -1,131 +0,0 @@
-#
-# RPM spec file for FLTK.
-#
-# Copyright 1998-2024 by Bill Spitzak and others.
-#
-# This library is free software. Distribution and use rights are outlined in
-# the file "COPYING" which should have been included with this file.  If this
-# file is missing or damaged, see the license at:
-#
-#      https://www.fltk.org/COPYING.php
-#
-# Please see the following page on how to report bugs and issues:
-#
-#      https://www.fltk.org/bugs.php
-#
-
-%define version @FLTK_VERSION@
-%define release 1
-%define prefix /usr
-
-Summary: Fast Light Tool Kit (FLTK)
-Name: fltk
-Version: %{version}
-Release: %{release}
-License: LGPL
-Group: System Environment/Libraries
-Source: https://www.fltk.org/pub/fltk/%{version}/fltk-%{version}-source.tar.gz
-URL: https://www.fltk.org/
-Packager: FLTK Developer <fltk@fltk.org>
-# use BuildRoot so as not to disturb the version already installed
-BuildRoot: /var/tmp/fltk-%{PACKAGE_VERSION}
-
-%description
-The Fast Light Tool Kit ("FLTK") is a cross-platform C++ GUI
-toolkit for UNIX(r)/Linux(r) (X11), Microsoft(r) Windows(r),
-and macOS(r).  FLTK provides modern GUI functionality without
-bloat and supports 3D graphics via OpenGL(r) and its built-in
-GLUT emulation.
-
-%package devel
-Summary: FLTK Development Environment
-Group: Development/Libraries
-
-%description devel
-Install fltk-devel if you need to develop FLTK applications.
-You'll need to install the fltk package if you plan to run
-dynamically linked applications.
-
-%package games
-Summary: FLTK Games
-Group: Games
-
-%description games
-Install fltk-games to play Block Attack!, Checkers, or Sudoku on your computer.
-
-%prep
-%setup
-
-%build
-CFLAGS="$RPM_OPT_FLAGS" CXXFLAGS="$RPM_OPT_FLAGS" LDFLAGS="$RPM_OPT_FLAGS" ./configure --prefix=%{prefix} --mandir=%{_mandir} --enable-largefile --enable-shared --enable-threads --enable-xft --enable-xinerama
-
-# If we got this far, all prerequisite libraries must be here.
-make
-
-%install
-# these lines just make sure the directory structure in the
-# RPM_BUILD_ROOT exists
-rm -rf $RPM_BUILD_ROOT
-mkdir -p $RPM_BUILD_ROOT
-
-make -e DESTDIR=$RPM_BUILD_ROOT install install-desktop
-
-%clean
-rm -rf $RPM_BUILD_ROOT
-
-%files
-%defattr(-,root,root)
-%dir %{prefix}/lib
-%{prefix}/lib/libfltk*.so.*
-
-%files devel
-%defattr(-,root,root)
-
-%dir %{prefix}/bin
-%{prefix}/bin/fltk-config
-%{prefix}/bin/fltk-options
-%{prefix}/bin/fluid
-
-%dir %{prefix}/include/FL
-%{prefix}/include/FL/*
-%{prefix}/include/Fl
-
-%dir %{prefix}/lib
-%{prefix}/lib/libfltk*.so
-%{prefix}/lib/libfltk*.a
-
-%dir %{_mandir}
-%{_mandir}/cat1/*
-%{_mandir}/cat3/*
-%{_mandir}/man1/*
-%{_mandir}/man3/*
-
-%dir %{prefix}/share/doc/fltk
-%{prefix}/share/doc/fltk/*
-
-%dir %{prefix}/share/applications
-%{prefix}/share/applications/*
-
-%dir %{prefix}/share/icons
-%{prefix}/share/icons/hicolor/*/apps/fluid.png
-
-%dir %{prefix}/share/mimelnk
-%{prefix}/share/mimelnk/*
-
-%files games
-%dir %{prefix}/bin
-%{prefix}/bin/blocks
-%{prefix}/bin/checkers
-%{prefix}/bin/sudoku
-
-%dir %{_mandir}
-%{_mandir}/cat6/*
-%{_mandir}/man6/*
-
-%dir %{prefix}/share/applications
-%{prefix}/share/applications/*
-
-%dir %{prefix}/share/icons
-%{prefix}/share/icons/hicolor/*/apps/blocks.png
-%{prefix}/share/icons/hicolor/*/apps/checkers.png
-%{prefix}/share/icons/hicolor/*/apps/sudoku.png
diff --git a/package/CMakeLists.txt b/package/CMakeLists.txt
new file mode 100644
index 000000000..e47f546ce
--- /dev/null
+++ b/package/CMakeLists.txt
@@ -0,0 +1,48 @@
+#
+# CMakeLists.txt to enable CPack for the FLTK project
+#
+# Copyright 2025 by Bill Spitzak and others.
+#
+# This library is free software. Distribution and use rights are outlined in
+# the file "COPYING" which should have been included with this file.  If this
+# file is missing or damaged, see the license at:
+#
+#     https://www.fltk.org/COPYING.php
+#
+# Please see the following page on how to report bugs and issues:
+#
+#     https://www.fltk.org/bugs.php
+#
+
+# Note: this file is included by add_subdirectory() only if it really
+# is to be used (top level project, maybe an option, etc.).
+# Therefore the code below is executed unconditionally...
+
+#######################################################################
+# Configure CPack parameters
+#######################################################################
+
+set(CPACK_PACKAGE_NAME                    "FLTK")
+set(CPACK_PACKAGE_VENDOR                  "The FLTK TEAM (fltk.org)")
+set(CPACK_PACKAGE_DESCRIPTION_SUMMARY     "Cross-platform GUI development library")
+set(CPACK_PACKAGE_INSTALL_DIRECTORY       "${CPACK_PACKAGE_NAME}")
+set(CPACK_PACKAGE_VERSION_MAJOR           "${FLTK_VERSION_MAJOR}")
+set(CPACK_PACKAGE_VERSION_MINOR           "${FLTK_VERSION_MINOR}")
+set(CPACK_PACKAGE_VERSION_PATCH           "${FLTK_VERSION_PATCH}")
+
+set(CPACK_VERBATIM_VARIABLES              TRUE)
+
+# The following files are used by *some* installers (not yet supported by FLTK).
+# These files would be located in the same directory as this file.
+# CMake uses default values if these variables are not defined.
+
+# set(CPACK_PACKAGE_DESCRIPTION_FILE        ${CMAKE_CURRENT_LIST_DIR}/Description.txt)
+# set(CPACK_RESOURCE_FILE_WELCOME           ${CMAKE_CURRENT_LIST_DIR}/Welcome.txt)
+# set(CPACK_RESOURCE_FILE_LICENSE           ${CMAKE_CURRENT_LIST_DIR}/License.txt)
+# set(CPACK_RESOURCE_FILE_README            ${CMAKE_CURRENT_LIST_DIR}/Readme.txt)
+
+#######################################################################
+# Include the CPack module
+#######################################################################
+
+include(CPack)