Do not install extlibs if SFML_USE_SYSTEM_DEPS is true.

Signed-off-by: Marty Plummer <ntzrmtthihu777@gmail.com>

CMakeLists.txt

@@ -408,24 +408,26 @@ endif()
 # install 3rd-party libraries and tools
 if(SFML_OS_WINDOWS)
 
-    # install the binaries of SFML dependencies
-    if(ARCH_32BITS)
-        install(DIRECTORY extlibs/bin/x86/ DESTINATION bin)
-        if(SFML_COMPILER_MSVC AND SFML_MSVC_VERSION LESS 14)
-            install(DIRECTORY extlibs/libs-msvc/x86/ DESTINATION lib)
-        elseif(SFML_COMPILER_MSVC)
-            install(DIRECTORY extlibs/libs-msvc-universal/x86/ DESTINATION lib)
-        else()
-            install(DIRECTORY extlibs/libs-mingw/x86/ DESTINATION lib)
-        endif()
-    elseif(ARCH_64BITS)
-        install(DIRECTORY extlibs/bin/x64/ DESTINATION bin)
-        if(SFML_COMPILER_MSVC AND SFML_MSVC_VERSION LESS 14)
-            install(DIRECTORY extlibs/libs-msvc/x64/ DESTINATION lib)
-        elseif(SFML_COMPILER_MSVC)
-            install(DIRECTORY extlibs/libs-msvc-universal/x64/ DESTINATION lib)
-        else()
-            install(DIRECTORY extlibs/libs-mingw/x64/ DESTINATION lib)
+    if(NOT SFML_USE_SYSTEM_DEPS)
+        # install the binaries of SFML dependencies
+        if(ARCH_32BITS)
+            install(DIRECTORY extlibs/bin/x86/ DESTINATION bin)
+            if(SFML_COMPILER_MSVC AND SFML_MSVC_VERSION LESS 14)
+                install(DIRECTORY extlibs/libs-msvc/x86/ DESTINATION lib)
+            elseif(SFML_COMPILER_MSVC)
+                install(DIRECTORY extlibs/libs-msvc-universal/x86/ DESTINATION lib)
+            else()
+                install(DIRECTORY extlibs/libs-mingw/x86/ DESTINATION lib)
+            endif()
+        elseif(ARCH_64BITS)
+            install(DIRECTORY extlibs/bin/x64/ DESTINATION bin)
+            if(SFML_COMPILER_MSVC AND SFML_MSVC_VERSION LESS 14)
+                install(DIRECTORY extlibs/libs-msvc/x64/ DESTINATION lib)
+            elseif(SFML_COMPILER_MSVC)
+                install(DIRECTORY extlibs/libs-msvc-universal/x64/ DESTINATION lib)
+            else()
+                install(DIRECTORY extlibs/libs-mingw/x64/ DESTINATION lib)
+            endif()
         endif()
     endif()