diff -rupN --no-dereference libwebp-1.2.3/CMakeLists.txt libwebp-1.2.3-new/CMakeLists.txt
--- libwebp-1.2.3/CMakeLists.txt	2022-07-15 21:48:16.000000000 +0200
+++ libwebp-1.2.3-new/CMakeLists.txt	2022-07-20 12:24:07.196022397 +0200
@@ -558,15 +558,15 @@ endif()
 
 if(WEBP_BUILD_VWEBP)
   # vwebp
-  find_package(GLUT)
-  if(GLUT_FOUND)
+  find_package(FreeGLUT)
+  if(FreeGLUT_FOUND)
     include_directories(${WEBP_DEP_IMG_INCLUDE_DIRS})
     parse_makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/examples "VWEBP_SRCS" "vwebp")
     add_executable(vwebp ${VWEBP_SRCS})
     target_link_libraries(vwebp
                           ${OPENGL_LIBRARIES}
                           exampleutil
-                          ${GLUT_glut_LIBRARY}
+                          glut
                           imageioutil
                           webp
                           webpdemux)
diff -rupN --no-dereference libwebp-1.2.3/examples/vwebp.c libwebp-1.2.3-new/examples/vwebp.c
--- libwebp-1.2.3/examples/vwebp.c	2022-07-15 21:48:16.000000000 +0200
+++ libwebp-1.2.3-new/examples/vwebp.c	2022-07-20 12:24:07.196022397 +0200
@@ -27,7 +27,7 @@
 #if defined(HAVE_GLUT_GLUT_H)
 #include <GLUT/glut.h>
 #else
-#include <GL/glut.h>
+#include <GL/freeglut.h>
 #ifdef FREEGLUT
 #include <GL/freeglut.h>
 #endif