/usr/src/newlib/patches/fix-include-paths-nano-specs.patch is in newlib-source 2.4.0.20160527-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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===================================================================
--- newlib-2.4.0.20160527.orig/libgloss/arm/elf-nano.specs
+++ newlib-2.4.0.20160527/libgloss/arm/elf-nano.specs
@@ -3,7 +3,7 @@
%rename cpp nano_cpp
*cpp:
--isystem =/include/newlib-nano %(nano_cpp)
+-isystem /usr/include/newlib/nano %(nano_cpp)
*nano_libc:
-lc_nano
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