commit 75b06d02c99fde416cbf902c52ce3b8d0a4be6ec
Author:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
AuthorDate: Thu Nov 24 07:22:27 2022 +0100
Commit:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
CommitDate: Thu Nov 24 07:22:27 2022 +0100

    CMake building: improve messages about necessary software packages

 CMake/options.cmake | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git CMake/options.cmake CMake/options.cmake
index 822f69e..8d27c11 100644
--- CMake/options.cmake
+++ CMake/options.cmake
@@ -232,25 +232,29 @@ if (UNIX)
     unset (OPTION_USE_XFIXES CACHE)
     if (X11_FOUND)
       if (NOT X11_Xfixes_FOUND)
-        message(FATAL_ERROR "*** Terminating: Install package libxfixes-dev")
+        message(WARNING "Install development headers for libXfixes (e.g., libxfixes-dev)")
       endif()
       set (HAVE_XFIXES 1)
       if (NOT X11_Xrender_FOUND)
-        message(FATAL_ERROR "*** Terminating: Install package libxrender-dev")
+        message(WARNING "Install development headers for libXrender (e.g., libxrender-dev)")
       endif()
       set (HAVE_XRENDER 1)
       if (NOT X11_Xft_FOUND)
-        message(FATAL_ERROR "*** Terminating: Install package libxft-dev")
+        message(WARNING "Install development headers for libXft (e.g., libxft-dev)")
       endif()
       set (USE_XFT 1)
       if (NOT X11_Xcursor_FOUND)
-        message(FATAL_ERROR "*** Terminating: Install package libxcursor-dev")
+        message(WARNING "Install development headers for libXcursor (e.g., libxcursor-dev)")
       endif()
       set (HAVE_XCURSOR 1)
       if (NOT X11_Xinerama_FOUND)
-        message(FATAL_ERROR "*** Terminating: Install package libxinerama-dev")
+        message(WARNING "Install development headers for libXinerama (e.g., libxinerama-dev)")
       endif()
       set (HAVE_XINERAMA 1)
+      if (NOT (X11_Xfixes_FOUND AND X11_Xrender_FOUND AND X11_Xft_FOUND AND X11_Xcursor_FOUND
+          AND X11_Xinerama_FOUND))
+        message (FATAL_ERROR "*** Terminating: one or more required software package(s) missing.")
+      endif ()
     endif (X11_FOUND)
     unset (OPTION_USE_PANGO CACHE)
     set (OPTION_USE_PANGO TRUE CACHE BOOL "use lib Pango")
@@ -765,6 +769,9 @@ if (OPTION_USE_WAYLAND AND NOT OPTION_USE_SYSTEM_LIBDECOR)
     pkg_check_modules(GTK gtk+-3.0)
     if (GTK_FOUND)
       include_directories (${GTK_INCLUDE_DIRS})
+    else ()
+      message(WARNING "Installation of the development files for the GTK library "
+      "(e.g., libgtk-3-dev) is recommended when using the gnome desktop.")
     endif (GTK_FOUND)
   endif (OPTION_ALLOW_GTK_PLUGIN)