1 files changed, 34 insertions, 31 deletions
diff --git a/cmake/opentrack-rift.cmake b/cmake/opentrack-rift.cmake
index ce2d8554..d4f8e8e1 100644
--- a/cmake/opentrack-rift.cmake
+++ b/cmake/opentrack-rift.cmake
@@ -1,32 +1,35 @@
-function(opentrack_rift_boilerplate proj opt)
-    if(${opt})
-        set(link-flags)
-        set(c-flags)
-        if(APPLE)
-            set(link-flags "-framework CoreFoundation -framework CoreGraphics -framework IOKit -framework Quartz")
-            set(c-flags "-fno-strict-aliasing")
-        elseif(NOT MSVC)
-            set(c-flags "-fno-strict-aliasing")
+if(NOT opentrack-rift-included)
+    set(opentrack-rift-included TRUE)
+    function(opentrack_rift_boilerplate proj opt)
+        if(${opt})
+            set(link-flags)
+            set(c-flags)
+            if(APPLE)
+                set(link-flags "-framework CoreFoundation -framework CoreGraphics -framework IOKit -framework Quartz")
+                set(c-flags "-fno-strict-aliasing")
+            elseif(NOT MSVC)
+                set(c-flags "-fno-strict-aliasing")
+            endif()
+            opentrack_boilerplate(${proj} LINK ${link-flags} COMPILE ${c-flags})
+            set(proj ${proj})
+            target_include_directories(${proj} SYSTEM PUBLIC ${${opt}}/Include ${${opt}}/Src)
+            set(c-flags)
+            set(link-flags)
+            if(MSVC)
+                set(ext lib)
+                set(p)
+            else()
+                set(ext a)
+                set(p lib)
+            endif()
+            target_link_libraries(${proj} ${${opt}}/libLibOVR.${ext})
+            if(WIN32)
+                target_link_libraries(${proj} winmm setupapi ws2_32 imagehlp wbemuuid)
+                set(ext)
+                set(p)
+            elseif(NOT APPLE)
+                target_link_libraries(${proj} udev Xinerama)
+            endif()
         endif()
-        opentrack_boilerplate(${proj} LINK ${link-flags} COMPILE ${c-flags})
-        set(proj ${proj})
-        target_include_directories(${proj} SYSTEM PUBLIC ${${opt}}/Include ${${opt}}/Src)
-        set(c-flags)
-        set(link-flags)
-        if(MSVC)
-            set(ext lib)
-            set(p)
-        else()
-            set(ext a)
-            set(p lib)
-        endif()
-        target_link_libraries(${proj} ${${opt}}/libLibOVR.${ext})
-        if(WIN32)
-            target_link_libraries(${proj} winmm setupapi ws2_32 imagehlp wbemuuid)
-            set(ext)
-            set(p)
-        elseif(NOT APPLE)
-            target_link_libraries(${proj} udev Xinerama)
-        endif()
-    endif()
-endfunction()
+    endfunction()
+endif()