diff --git a/CMakeLists.txt b/CMakeLists.txt
index 87a68c0f2..3b36efe96 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -215,14 +215,17 @@ if (UNIX)
   endif ()
   string(REPLACE "/undef " "#undef "
     FTCONFIG_H "${FTCONFIG_H}")
-  file(WRITE "${PROJECT_BINARY_DIR}/include/freetype/config/ftconfig.h"
+  file(WRITE "${PROJECT_BINARY_DIR}/include/freetype/config/ftconfig.h-new"
     "${FTCONFIG_H}")
 else ()
   file(READ "${PROJECT_SOURCE_DIR}/include/freetype/config/ftconfig.h"
     FTCONFIG_H)
-  file(WRITE "${PROJECT_BINARY_DIR}/include/freetype/config/ftconfig.h"
+  file(WRITE "${PROJECT_BINARY_DIR}/include/freetype/config/ftconfig.h-new"
     "${FTCONFIG_H}")
 endif ()
+execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
+  "${PROJECT_BINARY_DIR}/include/freetype/config/ftconfig.h-new"
+  "${PROJECT_BINARY_DIR}/include/freetype/config/ftconfig.h")
 
 
 # Create the options file
@@ -251,8 +254,11 @@ if (HARFBUZZ_FOUND)
     "/\\* +(#define +FT_CONFIG_OPTION_USE_HARFBUZZ) +\\*/" "\\1"
     FTOPTION_H "${FTOPTION_H}")
 endif ()
-file(WRITE "${PROJECT_BINARY_DIR}/include/freetype/config/ftoption.h"
+file(WRITE "${PROJECT_BINARY_DIR}/include/freetype/config/ftoption.h-new"
   "${FTOPTION_H}")
+execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
+  "${PROJECT_BINARY_DIR}/include/freetype/config/ftoption.h-new"
+  "${PROJECT_BINARY_DIR}/include/freetype/config/ftoption.h")
 
 
 # Specify library include directories
diff --git a/ChangeLog b/ChangeLog
index 5c9ec1374..8b2afe8a2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2016-06-09  David Capello  <davidcapello@gmail.com>
+
+	[cmake] Avoid modifying `ftconfig.h' and `ftoption.h' files.
+
+	* CMakeLists.txt: Each time cmake is run those files are
+	modified and the whole FreeType library is recompiled.  With this
+	change we change the files only if there are real modifications, so
+	we can avoid recompilations.
+
 2016-06-09  Werner Lemberg  <wl@gnu.org>
 
 	[bdf] Check number of properties (#48166).