adjust cmake not to attempt loads of packages on the wrong platforms

indra/cmake/GLEXT.cmake

@@ -2,7 +2,9 @@
 include(Prebuilt)
 
 if (NOT USESYSTEMLIBS)
-  use_prebuilt_binary(glext)
+  if (LINUX OR WINDOWS)
+    use_prebuilt_binary(glext)
+  endif (LINUX OR WINDOWS)  
   use_prebuilt_binary(glh-linear)
   set(GLEXT_INCLUDE_DIR ${LIBS_PREBUILT_DIR}/include)
 endif (NOT USESYSTEMLIBS)

indra/cmake/NDOF.cmake

@@ -8,7 +8,11 @@ if (NDOF)
     set(NDOF_FIND_REQUIRED ON)
     include(FindNDOF)
   else (USESYSTEMLIBS)
-    use_prebuilt_binary(libndofdev)
+    if (WINDOWS OR DARWIN)
+      use_prebuilt_binary(libndofdev)
+    elseif (LINUX)
+      use_prebuilt_binary(open-libndofdev)
+    endif (WINDOWS OR DARWIN)
 
     if (WINDOWS)
       set(NDOF_LIBRARY libndofdev)

indra/cmake/QuickTimePlugin.cmake

@@ -2,7 +2,9 @@
 
 if(INSTALL_PROPRIETARY)
   include(Prebuilt)
-  use_prebuilt_binary(quicktime)
+  if (WINDOWS)
+    use_prebuilt_binary(quicktime)
+  endif (WINDOWS)
 endif(INSTALL_PROPRIETARY)
 
 if (DARWIN)

indra/cmake/UI.cmake

@@ -32,7 +32,10 @@ if (USESYSTEMLIBS)
     add_definitions(${${pkg}_CFLAGS_OTHERS})
   endforeach(pkg)
 else (USESYSTEMLIBS)
-  use_prebuilt_binary(gtk-atk-pango-glib)
+  if (LINUX OR WINDOWS)
+    use_prebuilt_binary(gtk-atk-pango-glib)
+  endif (LINUX OR WINDOWS)
+
   if (LINUX)
     set(UI_LIBRARIES
         atk-1.0

indra/cmake/ViewerMiscLibs.cmake

@@ -2,9 +2,11 @@
 include(Prebuilt)
 
 if (NOT USESYSTEMLIBS)
+  if (LINUX)
+    use_prebuilt_binary(libuuid)
+    use_prebuilt_binary(fontconfig)
+  endif (LINUX)
   use_prebuilt_binary(libhunspell)
-  use_prebuilt_binary(libuuid)
   use_prebuilt_binary(slvoice)
-  use_prebuilt_binary(fontconfig)
 endif(NOT USESYSTEMLIBS)