diff --git a/CMakeLists.txt b/CMakeLists.txt
index 814633c5633e..28db1e3cbdd4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -76,8 +76,8 @@ else()
 	message(WARNING "You are cross-compiling. Skipping IEEE 754 test.")
 endif()
 
-find_package(OpenGL)
-find_package(GLEW)
+find_package(OpenGL REQUIRED)
+find_package(GLEW REQUIRED)
 find_package(SDL2 2.0.4 REQUIRED)
 find_package(Crypto 1.0 REQUIRED)
 find_package(Boost 1.56 REQUIRED COMPONENTS iostreams program_options regex system random)