Move before VTK again.

CMakeLists.txt

@@ -375,6 +375,12 @@ if(WITH_VTK)
   endif()
 endif()
 
+# GLEW before VTK as it uses custom findGLEW that doesn't work with glew-config.
+option(WITH_GLEW "Support for GLEW" TRUE)
+if(WITH_GLEW)
+  find_package(GLEW)
+endif()
+
 # VTK can depend on Qt and search for its required version, so search after so we can overwrite Qt5_FOUND/Qt6_FOUND if the version we require is not found.
 set(WITH_QT "AUTO" CACHE STRING "Build QT Front-End (AUTO|YES|QT6|QT5|NO)")
 set_property(CACHE WITH_QT PROPERTY STRINGS "AUTO" "YES" "QT6" "QT5" "NO")
@@ -394,12 +400,6 @@ if(WITH_OPENGL)
   include("${PCL_SOURCE_DIR}/cmake/pcl_find_gl.cmake")
 endif()
 
-# GLEW
-option(WITH_GLEW "Support for GLEW" TRUE)
-if(WITH_GLEW)
-  find_package(GLEW)
-endif()
-
 # Boost (required)
 include("${PCL_SOURCE_DIR}/cmake/pcl_find_boost.cmake")