diff --git a/elf.h b/elf.h
index 7279a569..b933f5dd 100644
--- a/elf.h
+++ b/elf.h
@@ -1,9 +1,12 @@
+// The build.yml macOS tasks require this elf.h file
+// Source: https://gist.github.com/mlafeldt/3885346#file-elf-h
+
 /* This is the original elf.h file from the GNU C Library; I only removed
    the inclusion of feature.h and added definitions of __BEGIN_DECLS and
    __END_DECLS as documented in
    https://cmd.inp.nsk.su/old/cmd2/manuals/gnudocs/gnudocs/libtool/libtool_36.html
 
-   On macOS, simply copy the file to /usr/local/include/. 
+   On macOS, simply copy the file to /usr/local/include/.
 
    Mathias Lafeldt <mathias.lafeldt@gmail.com> */
 
diff --git a/grug b/grug
index 903385c3..45e9d1d7 160000
--- a/grug
+++ b/grug
@@ -1 +1 @@
-Subproject commit 903385c377c6aebc2962f698cd29cb284c58949c
+Subproject commit 45e9d1d7619f44c710bf64cd0cd42cd0cbe18ac7