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nixpkgs/pkgs/applications/editors/emacs/at-fdcwd.patch

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diff --git a/lib/careadlinkat.h b/lib/careadlinkat.h
index 84ede3e..8e8f42e 100644
--- a/lib/careadlinkat.h
+++ b/lib/careadlinkat.h
@@ -23,6 +23,10 @@
#include <fcntl.h>
#include <unistd.h>
+#ifndef AT_FDCWD
+#define AT_FDCWD -2
+#endif
+
struct allocator;
/* Assuming the current directory is FD, get the symbolic link value