graf3d: use imported target for OpenGL

graf3d/eve/CMakeLists.txt

@@ -248,7 +248,8 @@ if(MSVC)
     G__Eve1.cxx
     G__Eve2.cxx
     LIBRARIES
-      ${OPENGL_LIBRARIES}
+      OpenGL::GL
+      OpenGL::GLU
       ${FTGL_LIBRARIES}
       ${GLEW_LIBRARIES}
     DEPENDENCIES
@@ -273,7 +274,8 @@ else()
     SOURCES
       ${EVE_SOURCES}
     LIBRARIES
-      ${OPENGL_LIBRARIES}
+      OpenGL::GL
+      OpenGL::GLU
       ${FTGL_LIBRARIES}
       ${GLEW_LIBRARIES}
     DEPENDENCIES
@@ -285,5 +287,3 @@ else()
       Physics
   )
 endif()
-
-target_include_directories(Eve PUBLIC ${OPENGL_INCLUDE_DIR})

graf3d/ftgl/CMakeLists.txt

@@ -2,7 +2,7 @@
 # CMakeLists.txt file for building ROOT graf3d/ftgl package
 ############################################################################
 
-include_directories(${OPENGL_INCLUDE_DIR} ${FREETYPE_INCLUDE_DIRS})
+include_directories(${FREETYPE_INCLUDE_DIRS})
 
 if(MACOSX_GLU_DEPRECATED)
   add_definitions(-Wno-deprecated-declarations)
@@ -32,7 +32,8 @@ ROOT_LINKER_LIBRARY(FTGL
     src/FTTextureGlyph.cxx
     src/FTVectoriser.cxx
   LIBRARIES
-    ${OPENGL_LIBRARIES}
+    OpenGL::GL
+    OpenGL::GLU
     ${FREETYPE_LIBRARIES}
     ZLIB::ZLIB
   BUILTINS

graf3d/glew/CMakeLists.txt

@@ -5,10 +5,11 @@
 ROOT_LINKER_LIBRARY(GLEW
   src/glew.c
   LIBRARIES
-    ${OPENGL_LIBRARIES}
+    OpenGL::GL
+    OpenGL::GLU
 )
 
-target_include_directories(GLEW PUBLIC ${OPENGL_INCLUDE_DIR} PRIVATE inc)
+target_include_directories(GLEW PRIVATE inc)
 
 # Do not install headers for all platforms and configurations.
 if(UNIX)