diff --git a/.gitattributes b/.gitattributes
index 3e5b64f..6755504 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,8 +1,11 @@
-*.h         eol=lf
-*.hpp       eol=lf
-*.c         eol=lf
-*.cpp       eol=lf
-.git*       eol=lf
+# Line endings are the repository's, not the editing machine's: this checkout
+# is reached from two hosts, and a file rewritten by a Windows tool comes back
+# with every line changed unless something says otherwise. Naming the source
+# extensions left Markdown, Python, shell and CMake to whatever the writing
+# tool defaulted to, which is CRLF on one of the two.
+* text=auto eol=lf
+
+# Atmel Studio writes these and expects them back.
 *.vcxproj*  eol=crlf
 *.cppproj   eol=crlf
 *.sln       eol=crlf
diff --git a/libavr b/libavr
index 00d669b..4cc850f 160000
--- a/libavr
+++ b/libavr
@@ -1 +1 @@
-Subproject commit 00d669b4510579d202bac059f46246448d5cac3b
+Subproject commit 4cc850f200df6bfc2f5c9448b85860d79987e1d9