diff --git a/Makefile b/Makefile
index 023fa67..7e569ce 100644
--- a/Makefile
+++ b/Makefile
@@ -520,7 +520,7 @@ build/ndk-include/_ndk13: build/ndk-include/_ndk
 	while read p; do \
 	  mkdir -p $(PREFIX)/m68k-amigaos/ndk13-include/$$(dirname $$p); \
 	  if grep V36 $(PREFIX)/m68k-amigaos/ndk-include/$$p; then \
-	  sed -n -e '/#ifndef  CLIB/,/V36/p' $(PREFIX)/m68k-amigaos/ndk-include/$$p >$(PREFIX)/m68k-amigaos/ndk13-include/$$p; \
+	  LC_CTYPE=C sed -n -e '/#ifndef  CLIB/,/V36/p' $(PREFIX)/m68k-amigaos/ndk-include/$$p >$(PREFIX)/m68k-amigaos/ndk13-include/$$p; \
 	  echo -e "#ifdef __cplusplus\n}\n#endif /* __cplusplus */\n#endif" >>$(PREFIX)/m68k-amigaos/ndk13-include/$$p; \
 	  else cp $(PREFIX)/m68k-amigaos/ndk-include/$$p $(PREFIX)/m68k-amigaos/ndk13-include/$$p; fi \
 	done < patches/ndk13/chfiles
@@ -528,7 +528,7 @@ build/ndk-include/_ndk13: build/ndk-include/_ndk
 	echo '#undef	EXECNAME' > $(PREFIX)/m68k-amigaos/ndk13-include/exec/execname.h
 	echo '#define	EXECNAME	"exec.library"' >> $(PREFIX)/m68k-amigaos/ndk13-include/exec/execname.h
 	mkdir -p $(PREFIX)/m68k-amigaos/ndk/lib/fd13
-	while read p; do sed -n -e '/##base/,/V36/P'  $(PREFIX)/m68k-amigaos/ndk/lib/fd/$$p >$(PREFIX)/m68k-amigaos/ndk/lib/fd13/$$p; done < patches/ndk13/fdfiles
+	while read p; do LC_CTYPE=C sed -n -e '/##base/,/V36/P'  $(PREFIX)/m68k-amigaos/ndk/lib/fd/$$p >$(PREFIX)/m68k-amigaos/ndk/lib/fd13/$$p; done < patches/ndk13/fdfiles
 	mkdir -p $(PREFIX)/m68k-amigaos/ndk/lib/sfd13
 	for i in $(PREFIX)/m68k-amigaos/ndk/lib/fd13/*; do fd2sfd $$i $(PREFIX)/m68k-amigaos/ndk13-include/clib/$$(basename $$i _lib.fd)_protos.h > $(PREFIX)/m68k-amigaos/ndk/lib/sfd13/$$(basename $$i .fd).sfd; done
 	for i in $(PREFIX)/m68k-amigaos/ndk/lib/sfd13/*; do \