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-rw-r--r--libcpp/init.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/libcpp/init.c b/libcpp/init.c
index f10413a..b809515 100644
--- a/libcpp/init.c
+++ b/libcpp/init.c
@@ -27,8 +27,12 @@ along with this program; see the file COPYING3. If not see
#include "filenames.h"
#ifndef ENABLE_CANONICAL_SYSTEM_HEADERS
+#ifdef HAVE_DOS_BASED_FILE_SYSTEM
+#define ENABLE_CANONICAL_SYSTEM_HEADERS 1
+#else
#define ENABLE_CANONICAL_SYSTEM_HEADERS 0
#endif
+#endif
static void init_library (void);
static void mark_named_operators (cpp_reader *, int);