diff --git a/CMake/variables.cmake b/CMake/variables.cmake
index 8908bd513..25bbefaeb 100644
--- a/CMake/variables.cmake
+++ b/CMake/variables.cmake
@@ -82,7 +82,7 @@ endif ()
 set (IMAGELIBS)
 set (STATICIMAGELIBS)
 
-if (FLTK_BUILTIN_JPEG_FOUND)
+if (FLTK_USE_BUILTIN_JPEG)
   list (APPEND IMAGELIBS -lfltk_jpeg)
   list (APPEND STATICIMAGELIBS \$libdir/libfltk_jpeg.a)
 else ()
@@ -90,9 +90,9 @@ else ()
     list (APPEND IMAGELIBS -ljpeg)
     list (APPEND STATICIMAGELIBS -ljpeg)
   endif (LIB_jpeg)
-endif (FLTK_BUILTIN_JPEG_FOUND)
+endif (FLTK_USE_BUILTIN_JPEG)
 
-if (FLTK_BUILTIN_PNG_FOUND)
+if (FLTK_USE_BUILTIN_PNG)
   list (APPEND IMAGELIBS -lfltk_png)
   list (APPEND STATICIMAGELIBS \$libdir/libfltk_png.a)
 else ()
@@ -100,9 +100,9 @@ else ()
     list (APPEND IMAGELIBS -lpng)
     list (APPEND STATICIMAGELIBS -lpng)
   endif (LIB_png)
-endif (FLTK_BUILTIN_PNG_FOUND)
+endif (FLTK_USE_BUILTIN_PNG)
 
-if (FLTK_BUILTIN_ZLIB_FOUND)
+if (FLTK_USE_BUILTIN_ZLIB)
   list (APPEND IMAGELIBS -lfltk_z)
   list (APPEND STATICIMAGELIBS \$libdir/libfltk_z.a)
 else ()
@@ -110,7 +110,7 @@ else ()
     list (APPEND IMAGELIBS -lz)
     list (APPEND STATICIMAGELIBS -lz)
   endif (LIB_zlib)
-endif (FLTK_BUILTIN_ZLIB_FOUND)
+endif (FLTK_USE_BUILTIN_ZLIB)
 
 string (REPLACE ";" " " IMAGELIBS "${IMAGELIBS}")
 string (REPLACE ";" " " STATICIMAGELIBS "${STATICIMAGELIBS}")