Don't try to find OpenGL ES more times than necessary.

modules/FindMagnum.cmake

@@ -92,7 +92,6 @@ foreach(component ${Magnum_FIND_COMPONENTS})
 
         # X/EGL context dependencies
         if(${component} STREQUAL EglContext)
-            find_package(OpenGLES2)
             find_package(EGL)
             find_package(X11)
             if(NOT OPENGLES2_FOUND OR NOT EGL_FOUND OR NOT X11_FOUND)

src/Contexts/CMakeLists.txt

@@ -27,14 +27,13 @@ endif()
 
 # X/EGL context
 if(WITH_EGLCONTEXT)
-    find_package(OpenGLES2)
     find_package(EGL)
     find_package(X11)
-    if(OPENGLES2_FOUND AND EGL_FOUND AND X11_FOUND)
+    if(EGL_FOUND AND X11_FOUND)
         add_library(MagnumEglContext STATIC EglContext.cpp)
         install(FILES EglContext.h DESTINATION ${MAGNUM_INCLUDE_INSTALL_DIR}/Contexts)
         install(TARGETS MagnumEglContext DESTINATION ${MAGNUM_LIBRARY_INSTALL_DIR})
     else()
-        message(FATAL_ERROR "OpenGL ES 2, EGL or X11 libraries, required by EglContext, were not found. Set WITH_EGLCONTEXT to OFF to skip building it.")
+        message(FATAL_ERROR "EGL or X11 libraries, required by EglContext, were not found. Set WITH_EGLCONTEXT to OFF to skip building it.")
     endif()
 endif()