Rename config header input files to better names

Up to FLTK 1.4 we had two distinct input files for each header file:
one for configure and one for CMake. Since 1.5 we have only one input
file for each header which can now have a more appropriate name.

1) configh.cmake.in   -> config.h.in
2) fl_config.cmake.in -> fl_config.h.in

4 files changed, 18 insertions, 14 deletions

diff --git a/CMake/export.cmake b/CMake/export.cmake
index 5ae2b84da..642be6762 100644
--- a/CMake/export.cmake
+++ b/CMake/export.cmake
@@ -150,7 +150,7 @@ else(IS_ABSOLUTE "${FLTK_DOCDIR}")
   set(PREFIX_DOC "${CMAKE_INSTALL_PREFIX}/${FLTK_DOCDIR}/fltk")
 endif(IS_ABSOLUTE "${FLTK_DOCDIR}")
 
-set(CONFIG_H_IN configh.cmake.in)
+set(CONFIG_H_IN config.h.in)
 set(CONFIG_H config.h)
 
 # generate config.h
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d1496fc16..db6e0bb8e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -267,7 +267,7 @@ include(CMake/variables.cmake)
 include(CMake/export.cmake)
 
 configure_file(
-  ${CMAKE_CURRENT_SOURCE_DIR}/fl_config.cmake.in
+  ${CMAKE_CURRENT_SOURCE_DIR}/fl_config.h.in
   ${CMAKE_CURRENT_BINARY_DIR}/FL/fl_config.h
   @ONLY
 )
diff --git a/configh.cmake.in b/config.h.in
index b01d4fba6..b74a7a1ac 100644
--- a/configh.cmake.in
+++ b/config.h.in
@@ -1,8 +1,9 @@
 /* @CONFIG_H@.  Generated from @CONFIG_H_IN@ by CMake.  */
 /*
- * Configuration file for the Fast Light Tool Kit (FLTK).
+ * Configuration file for the Fast Light Tool Kit (FLTK). This file is used
+ * internally in the FLTK library and is not publicly available (not installed).
  *
- * Copyright 1998-2024 by Bill Spitzak and others.
+ * Copyright 1998-2025 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
@@ -16,15 +17,17 @@
  */
 
 /*
- * Note: configure syntax vs. CMake syntax in source files (examples):
+ * Note: CMake syntax in input file (examples):
  *
- *   configh.in               configh.cmake.in
- *   ---------------------    ----------------------------
- *   [#]define HAVE_GL 0      [#]cmakedefine01 HAVE_GL
- *   [#]undef HAVE_SNPRINTF   [#]cmakedefine HAVE_SNPRINTF 1
+ *   For instance in @CONFIG_H_IN@ (remove brackets for real syntax):
+ *   ----------------------------------------------------------------
+ *   [#]cmakedefine01  HAVE_GL
+ *   [#]cmakedefine    HAVE_SNPRINTF  1
  *
- *   The former defines the given macro either as 0 or 1,
- *   the latter either does not define the macro or defines it as 1.
+ *   The former defines HAVE_GL either as 0 or 1.
+ *
+ *   The latter either doesn't define HAVE_SNPRINTF or defines it as 1.
+ *   The value (1 in the example) can be an arbitrary number or string.
  */
 
 /*
diff --git a/fl_config.cmake.in b/fl_config.h.in
index 1610534fb..6f46cf65f 100644
--- a/fl_config.cmake.in
+++ b/fl_config.h.in
@@ -1,8 +1,9 @@
-/* FL/fl_config.h.  Generated from fl_config.cmake.in by CMake.  */
+/* FL/fl_config.h.  Generated from fl_config.h.in by CMake.  */
 /*
- * Build configuration file for the Fast Light Tool Kit (FLTK).
+ * Build configuration file for the Fast Light Tool Kit (FLTK). This
+ * configuration file is publicly accessible by user programs (installed).
  *
- * Copyright 1998-2024 by Bill Spitzak and others.
+ * Copyright 1998-2025 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