R Under development (unstable) (2023-08-05 r84874 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> stopifnot(identical(
+     this.path:::.is.clipboard(c("clipboard", "clipboard-128", "X11_primary", "X11_secondary", "X11_clipboard")),
+     if (.Platform$OS.type == "windows")
+         c(TRUE , TRUE , FALSE, FALSE, FALSE)
+     else
+         c(TRUE , FALSE, TRUE , TRUE , TRUE )
+ ))
> 
> proc.time()
   user  system elapsed 
   0.10    0.04    0.14