diff --git a/binutils/include/filenames.h b/binutils/include/filenames.h
index 1bcfddb87a..f27a144bda 100644
--- a/binutils/include/filenames.h
+++ b/binutils/include/filenames.h
@@ -36,17 +36,21 @@ extern "C" {
 #  ifndef HAVE_DOS_BASED_FILE_SYSTEM
 #    define HAVE_DOS_BASED_FILE_SYSTEM 1
 #  endif
+/*
 #  ifndef HAVE_CASE_INSENSITIVE_FILE_SYSTEM
 #    define HAVE_CASE_INSENSITIVE_FILE_SYSTEM 1
 #  endif
+*/
 #  define HAS_DRIVE_SPEC(f) HAS_DOS_DRIVE_SPEC (f)
 #  define IS_DIR_SEPARATOR(c) IS_DOS_DIR_SEPARATOR (c)
 #  define IS_ABSOLUTE_PATH(f) IS_DOS_ABSOLUTE_PATH (f)
 #else /* not DOSish */
 #  if defined(__APPLE__)
+/*
 #    ifndef HAVE_CASE_INSENSITIVE_FILE_SYSTEM
 #      define HAVE_CASE_INSENSITIVE_FILE_SYSTEM 1
 #    endif
+*/
 #  endif /* __APPLE__ */
 #  define HAS_DRIVE_SPEC(f) (0)
 #  define IS_DIR_SEPARATOR(c) IS_UNIX_DIR_SEPARATOR (c)
diff --git a/gcc/include/filenames.h b/gcc/include/filenames.h
index 6164048c27..47e4fd9906 100644
--- a/gcc/include/filenames.h
+++ b/gcc/include/filenames.h
@@ -36,17 +36,21 @@ extern "C" {
 #  ifndef HAVE_DOS_BASED_FILE_SYSTEM
 #    define HAVE_DOS_BASED_FILE_SYSTEM 1
 #  endif
+/*
 #  ifndef HAVE_CASE_INSENSITIVE_FILE_SYSTEM
 #    define HAVE_CASE_INSENSITIVE_FILE_SYSTEM 1
 #  endif
+*/
 #  define HAS_DRIVE_SPEC(f) HAS_DOS_DRIVE_SPEC (f)
 #  define IS_DIR_SEPARATOR(c) IS_DOS_DIR_SEPARATOR (c)
 #  define IS_ABSOLUTE_PATH(f) IS_DOS_ABSOLUTE_PATH (f)
 #else /* not DOSish */
 #  if defined(__APPLE__)
+/*
 #    ifndef HAVE_CASE_INSENSITIVE_FILE_SYSTEM
 #      define HAVE_CASE_INSENSITIVE_FILE_SYSTEM 1
 #    endif
+*/
 #  endif /* __APPLE__ */
 #  define HAS_DRIVE_SPEC(f) (0)
 #  define IS_DIR_SEPARATOR(c) IS_UNIX_DIR_SEPARATOR (c)