--- gcc/config/i386/xm-dos.h	2018/04/24 18:10:27	1.1
+++ gcc/config/i386/xm-dos.h	2018/04/24 18:31:07	1.1.1.3
@@ -6,9 +6,15 @@
 /* Use semicolons to separate elements of a path.  */
 #define PATH_SEPARATOR ';'
 
+/* Use backslashs to separate levels of directory.  */
+#define DIR_SEPARATOR '\\'
+
 /* Suffix for executable file names.  */
 #define EXECUTABLE_SUFFIX ".exe"
 
 #define MKTEMP_EACH_FILE 1
 
 #define NO_PRECOMPILES 1
+
+/* sys_errlist proto in cccp.c doesn't match djgpp */
+#define HAVE_STRERROR