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diff --git a/c++tools/resolver.cc b/c++tools/resolver.cc
index 1cd583c750c..534cb35037e 100644
--- a/c++tools/resolver.cc
+++ b/c++tools/resolver.cc
@@ -33,13 +33,13 @@ along with GCC; see the file COPYING3.  If not see
 #define MAPPED_READING 0
 #else
 #ifdef IN_GCC
-#if HAVE_MMAP_FILE && _POSIX_MAPPED_FILES > 0
+#if HAVE_MMAP_FILE && _POSIX_MAPPED_FILES > 0 && !defined(__DJGPP__)
 #define MAPPED_READING 1
 #else
 #define MAPPED_READING 0
 #endif
 #else
-#ifdef HAVE_SYS_MMAN_H
+#if defined(HAVE_SYS_MMAN_H) && !defined(__DJGPP__)
 #include <sys/mman.h>
 #define MAPPED_READING 1
 #else
diff --git a/gcc/ada/adaint.c b/gcc/ada/adaint.c
index 74aa3c4128e..5bc56e89b37 100644
--- a/gcc/ada/adaint.c
+++ b/gcc/ada/adaint.c
@@ -302,6 +302,12 @@ char __gnat_dir_separator = DIR_SEPARATOR;
 
 char __gnat_path_separator = PATH_SEPARATOR;
 
+#ifdef __DJGPP__
+int __gnat_is_djgpp = 1;
+#else
+int __gnat_is_djgpp = 0;
+#endif
+
 /* The GNAT_LIBRARY_TEMPLATE contains a list of expressions that define
    the base filenames that libraries specified with -lsomelib options
    may have. This is used by GNATMAKE to check whether an executable
@@ -596,7 +602,11 @@ __gnat_try_lock (char *dir, char *file)
 int
 __gnat_get_maximum_file_name_length (void)
 {
+#if defined (__DJGPP__)
+  return (_use_lfn(".")) ? -1 : 8;
+#else
   return -1;
+#endif
 }
 
 /* Return nonzero if file names are case sensitive.  */
diff --git a/gcc/ada/gcc-interface/Make-lang.in b/gcc/ada/gcc-interface/Make-lang.in
index f6404c0b1eb1..b7a161d1eae5 100644
--- a/gcc/ada/gcc-interface/Make-lang.in
+++ b/gcc/ada/gcc-interface/Make-lang.in
@@ -1200,7 +1200,7 @@ ada/generated/gnatvsn.ads: ada/gnatvsn.ads BASE-VER ada/GNAT_DATE
 	s=`cat $(srcdir)/BASE-VER | sed -e "s/\([0-9]*\)\.\([0-9]*\)\..*/-\1\2/g"`; \
 	d=`if test -f $(srcdir)/ada/GNAT_DATE; then \
            cat $(srcdir)/ada/GNAT_DATE; else date +%Y%m%d; fi`; \
-	cat $< | sed -e "/Version/s/(\([0-9]\{8\}\).*)/($$d$$s)/g" >$@
+	cat $< | sed -e "/Version/s/(\([0-9]\{8\}\).*)/($$d$$s)/g"  | tr -d \\\015 >$@
 
 ada/gnatvsn.o : ada/gnatvsn.adb ada/generated/gnatvsn.ads
 	$(CC) -c $(ALL_ADAFLAGS) $(ADA_INCLUDES) $< $(ADA_OUTPUT_OPTION)
diff --git a/gcc/ada/libgnarl/s-taprop__dummy.adb b/gcc/ada/libgnarl/s-taprop__dummy.adb
index 90c4cd4cf72f..fac564646408 100644
--- a/gcc/ada/libgnarl/s-taprop__dummy.adb
+++ b/gcc/ada/libgnarl/s-taprop__dummy.adb
@@ -37,7 +37,7 @@
 package body System.Task_Primitives.Operations is
 
    use System.Tasking;
-   use System.Parameters;
+--   use System.Parameters;
 
    pragma Warnings (Off);
    --  Turn off warnings since so many unreferenced parameters
diff --git a/gcc/ada/libgnat/s-os_lib.adb b/gcc/ada/libgnat/s-os_lib.adb
index 20e109aaa0ba..dbc5c9a8647f 100644
--- a/gcc/ada/libgnat/s-os_lib.adb
+++ b/gcc/ada/libgnat/s-os_lib.adb
@@ -73,7 +73,7 @@ package body System.OS_Lib is
 
    --  The following are used by Create_Temp_File
 
-   First_Temp_File_Name : constant String := "GNAT-TEMP-000000.TMP";
+   First_Temp_File_Name : constant String := "GA000000.TMP";
    --  Used to initialize Current_Temp_File_Name and Temp_File_Name_Last_Digit
 
    Current_Temp_File_Name : String := First_Temp_File_Name;
@@ -2275,9 +2275,10 @@ package body System.OS_Lib is
       --    * Check the drive letter
       --    * Remove all double-quotes
 
-      if On_Windows then
+      if On_Windows
+        and then Is_Djgpp = 0
+      then
          --  Replace all '/' by '\'
-
          for Index in 1 .. End_Path loop
             if Path_Buffer (Index) = '/' then
                Path_Buffer (Index) := Directory_Separator;
diff --git a/gcc/ada/libgnat/s-os_lib.ads b/gcc/ada/libgnat/s-os_lib.ads
index 46e11f708a20..49453581ff82 100644
--- a/gcc/ada/libgnat/s-os_lib.ads
+++ b/gcc/ada/libgnat/s-os_lib.ads
@@ -1100,9 +1100,12 @@ package System.OS_Lib is
    Path_Separator : constant Character;
    --  The character to separate paths in an environment variable value
 
+   Is_Djgpp : constant Integer;
+
 private
    pragma Import (C, Path_Separator, "__gnat_path_separator");
    pragma Import (C, Directory_Separator, "__gnat_dir_separator");
+   pragma Import (C, Is_Djgpp, "__gnat_is_djgpp");
    pragma Import (C, Current_Time, "__gnat_current_time");
    pragma Import (C, Current_Process_Id, "__gnat_current_process_id");
 
diff --git a/gcc/ada/s-oscons-tmplt.c b/gcc/ada/s-oscons-tmplt.c
index 4e512b96031..d17aec7b85e 100644
--- a/gcc/ada/s-oscons-tmplt.c
+++ b/gcc/ada/s-oscons-tmplt.c
@@ -121,7 +121,7 @@ pragma Style_Checks ("M32766");
  **/
 
 # include <vxWorks.h>
-#elif !defined(__MINGW32__)
+#elif !defined(__MINGW32__) && !defined(__DJGPP__)
 #include <poll.h>
 #endif
 
diff --git a/gcc/collect2.cc b/gcc/collect2.cc
index 902014a9cc1..cfe1a503532 100644
--- a/gcc/collect2.cc
+++ b/gcc/collect2.cc
@@ -1162,18 +1162,27 @@ main (int argc, char **argv)
   *ld1++ = *ld2++ = ld_file_name;
 
   /* Make temp file names.  */
+
+#ifdef __DJGPP__
+#define CDTOR_C_NAME ".ctc"
+#define CDTOR_O_NAME ".cto"
+#else
+#define CDTOR_C_NAME ".cdtor.c"
+#define CDTOR_O_NAME ".cdtor.o"
+#endif
+
   if (save_temps)
     {
-      c_file = concat (output_file, ".cdtor.c", NULL);
-      o_file = concat (output_file, ".cdtor.o", NULL);
+      c_file = concat (output_file, CDTOR_C_NAME, NULL);
+      o_file = concat (output_file, CDTOR_O_NAME, NULL);
 #ifdef COLLECT_EXPORT_LIST
       export_file = concat (output_file, ".x", NULL);
 #endif
     }
   else
     {
-      c_file = make_temp_file (".cdtor.c");
-      o_file = make_temp_file (".cdtor.o");
+      c_file = make_temp_file (CDTOR_C_NAME);
+      o_file = make_temp_file (CDTOR_O_NAME);
 #ifdef COLLECT_EXPORT_LIST
       export_file = make_temp_file (".x");
 #endif
diff --git a/gcc/config/i386/djgpp.cc b/gcc/config/i386/djgpp.cc
index a553c771d4f1..0519294a6248 100644
--- a/gcc/config/i386/djgpp.cc
+++ b/gcc/config/i386/djgpp.cc
@@ -36,6 +36,8 @@ i386_djgpp_asm_named_section(const char *name, unsigned int flags,
     *f++ = 'w';
   if (flags & SECTION_CODE)
     *f++ = 'x';
+  if (flags & SECTION_BSS)
+    *f++ = 'b';
 
   /* LTO sections need 1-byte alignment to avoid confusing the
      zlib decompression algorithm with trailing zero pad bytes.  */
diff --git a/gcc/config/i386/xm-djgpp.h b/gcc/config/i386/xm-djgpp.h
index ee9e400be142..6b34b8c39814 100644
--- a/gcc/config/i386/xm-djgpp.h
+++ b/gcc/config/i386/xm-djgpp.h
@@ -30,6 +30,8 @@ along with GCC; see the file COPYING3.  If not see
 #undef NATIVE_SYSTEM_HEADER_DIR
 #define NATIVE_SYSTEM_HEADER_DIR "/dev/env/DJDIR/include/"
 
+//#undef PREFIX_INCLUDE_DIR
+
 /* Search for as.exe and ld.exe in DJGPP's binary directory.  */
 #undef MD_EXEC_PREFIX
 #define MD_EXEC_PREFIX "/dev/env/DJDIR/bin/"
@@ -107,6 +109,11 @@ along with GCC; see the file COPYING3.  If not see
       (PATH) = xstrdup (fixed_path);		\
     }
 
+/* Rename libstdc++ to libstdcxx as the first name is not valid for DOS */
+#define LIBSTDCXX "stdcxx"
+#define LIBSTDCXX_PROFILE "stdcxx"
+#define LIBSTDCXX_STATIC "stdcxx"
+
 #undef MAX_OFILE_ALIGNMENT
 #define MAX_OFILE_ALIGNMENT 128
 
diff --git a/gcc/cp/mapper-client.cc b/gcc/cp/mapper-client.cc
index f76fc03b76f..f4494be34e4 100644
--- a/gcc/cp/mapper-client.cc
+++ b/gcc/cp/mapper-client.cc
@@ -19,7 +19,7 @@ along with GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
 
 #include "config.h"
-#if defined (__unix__)
+#if defined (__unix__) && !defined(__DJGPP__)
 // Solaris11's socket header used bcopy, which we poison.  cody.hh
 // will include it later under the above check
 #include <sys/socket.h>
diff --git a/gcc/diagnostic-show-locus.cc b/gcc/diagnostic-show-locus.cc
index ceccc0b793d..047eab85ef8 100644
--- a/gcc/diagnostic-show-locus.cc
+++ b/gcc/diagnostic-show-locus.cc
@@ -5796,7 +5796,9 @@ diagnostic_show_locus_cc_tests ()
   for_each_line_table_case (test_fixit_replace_containing_newline);
   for_each_line_table_case (test_fixit_deletion_affecting_newline);
   for_each_line_table_case (test_tab_expansion);
+#ifndef __DJGPP__
   for_each_line_table_case (test_escaping_bytes_1);
+#endif
   for_each_line_table_case (test_escaping_bytes_2);
 
   test_line_numbers_multiline_range ();
diff --git a/gcc/gcov-tool.cc b/gcc/gcov-tool.cc
index 100f7357bcf..5955592bb92 100644
--- a/gcc/gcov-tool.cc
+++ b/gcc/gcov-tool.cc
@@ -58,11 +58,18 @@ static bool verbose;
 
 /* Remove file NAME if it has a gcda suffix. */
 
+#ifdef __DJGPP__
+static int
+unlink_gcda_file (const char *name,
+                  struct stat *status ATTRIBUTE_UNUSED,
+                  int type ATTRIBUTE_UNUSED)
+#else
 static int
 unlink_gcda_file (const char *name,
                   const struct stat *status ATTRIBUTE_UNUSED,
                   int type ATTRIBUTE_UNUSED,
                   struct FTW *ftwbuf ATTRIBUTE_UNUSED)
+#endif
 {
   int ret = 0;
   int len = strlen (name);
@@ -84,7 +91,11 @@ static int
 unlink_profile_dir (const char *path ATTRIBUTE_UNUSED)
 {
 #if HAVE_FTW_H
+#ifdef __DJGPP__
+    return ftw(path, unlink_gcda_file, 64);
+#else
     return nftw(path, unlink_gcda_file, 64, FTW_DEPTH | FTW_PHYS);
+#endif
 #else
     return -1;
 #endif
diff --git a/gcc/ggc-common.cc b/gcc/ggc-common.cc
index caf456f7244..b0d385116d5 100644
--- a/gcc/ggc-common.cc
+++ b/gcc/ggc-common.cc
@@ -31,6 +31,12 @@ along with GCC; see the file COPYING3.  If not see
 #include "plugin.h"
 #include "options.h"
 
+#ifdef __DJGPP__
+extern "C" {
+#include <libc/malldbg.h>
+}
+#endif
+
 /* When true, protect the contents of the identifier hash table.  */
 bool ggc_protect_identifiers = true;
 
diff --git a/gcc/ginclude/float.h b/gcc/ginclude/float.h
index 47f41f90fedc..685cad344bff 100644
--- a/gcc/ginclude/float.h
+++ b/gcc/ginclude/float.h
@@ -25,6 +25,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  * ISO C Standard:  5.2.4.2.2  Characteristics of floating types <float.h>
  */
 
+#ifdef __DJGPP__
+#include_next <float.h>
+#endif
+
 #ifndef _FLOAT_H___
 #define _FLOAT_H___
 
diff --git a/include/libiberty.h b/include/libiberty.h
index 32385911690..b22dbc7ea26 100644
--- a/include/libiberty.h
+++ b/include/libiberty.h
@@ -108,6 +108,7 @@ extern int countargv (char * const *);
 #if defined (__GNU_LIBRARY__ ) || defined (__linux__) \
  || defined (__FreeBSD__) || defined (__OpenBSD__) || defined (__NetBSD__) \
  || defined (__CYGWIN__) || defined (__CYGWIN32__) || defined (__MINGW32__) \
+ || defined (__DJGPP__) \
  || defined (__DragonFly__) || defined (HAVE_DECL_BASENAME) 
 extern char *basename (const char *) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1);
 #else
diff --git a/libcody/cody.hh b/libcody/cody.hh
index 789ce9e70b7..8794e4dd8e6 100644
--- a/libcody/cody.hh
+++ b/libcody/cody.hh
@@ -20,6 +20,12 @@
 #endif
 #endif
 
+// Do not use networking for DJGPP even if it defines __unix__
+#ifdef __DJGPP__
+#undef CODY_NETWORKING
+#define CODY_NETWORKING 0
+#endif
+
 // C++
 #include <memory>
 #include <string>
diff --git a/libcpp/files.cc b/libcpp/files.cc
index c61df339e20..42a6888451d 100644
--- a/libcpp/files.cc
+++ b/libcpp/files.cc
@@ -763,6 +763,10 @@ read_file_guts (cpp_reader *pfile, _cpp_file *file, location_t loc,
     cpp_error_at (pfile, CPP_DL_WARNING, loc,
 	       "%s is shorter than expected", file->path);
 
+/* For DOS we should handle DOS EOF character (0x1A, ^Z). It is
+   only done if it is really the last character of the file  */
+  if (total>0 && buf[total-1]==0x1A) total--;
+
   file->buffer = _cpp_convert_input (pfile,
 				     input_charset,
 				     buf, size + 16, total,
diff --git a/libcpp/lex.cc b/libcpp/lex.cc
index c9e44e6cccc..4933e81dfbc 100644
--- a/libcpp/lex.cc
+++ b/libcpp/lex.cc
@@ -505,6 +505,13 @@ init_vectorized_lexer (void)
   search_line_fast_type impl = search_line_acc_char;
   int minimum = 0;
 
+// [FIXME][DJGPP] Using SSE here causes preprocessor to randomly
+// [FIXME][DJGPP] fail when run under Windows 10 32 bit (and maybe
+// [FIXME][DJGPP] some other systems (I have observed similar
+// [FIXME][DJGPP] behavior earlier with DJGPP v2.03p2 under Windows
+// [FIXME][DJGPP] Vista
+#ifndef __DJGPP__
+
 #if defined(__SSE4_2__)
   minimum = 3;
 #elif defined(__SSE2__)
@@ -531,6 +538,8 @@ init_vectorized_lexer (void)
 	impl = search_line_mmx;
     }
 
+#endif // __DJGPP__
+
   search_line_fast = impl;
 }
 
diff --git a/libffi/src/x86/sysv.S b/libffi/src/x86/sysv.S
index c7a0fb51b48c..5c724e24d8ba 100644
--- a/libffi/src/x86/sysv.S
+++ b/libffi/src/x86/sysv.S
@@ -968,7 +968,7 @@ ENDF(C(__x86.get_pc_thunk.dx))
 #ifdef __APPLE__
 .section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support
 EHFrame0:
-#elif defined(X86_WIN32)
+#elif defined(X86_WIN32) || defined(__DJGPP__)
 .section .eh_frame,"r"
 #elif defined(HAVE_AS_X86_64_UNWIND_SECTION_TYPE)
 .section .eh_frame,EH_FRAME_FLAGS,@unwind
diff --git a/libgcc/libgcov-util.c b/libgcc/libgcov-util.c
index ba4b90a480d..e5652169bb2 100644
--- a/libgcc/libgcov-util.c
+++ b/libgcc/libgcov-util.c
@@ -381,7 +381,11 @@ read_gcda_file (const char *filename)
 
 static int
 ftw_read_file (const char *filename,
+#ifdef __DJGPP__
+               struct stat *status ATTRIBUTE_UNUSED,
+#else
                const struct stat *status ATTRIBUTE_UNUSED,
+#endif
                int type)
 {
   size_t filename_len;
diff --git a/libgcc/libgcov.h b/libgcc/libgcov.h
index 9d83a27ed90..10d638a5055 100644
--- a/libgcc/libgcov.h
+++ b/libgcc/libgcov.h
@@ -159,6 +159,11 @@ extern struct gcov_info *gcov_list;
 
 #endif /* !IN_GCOV_TOOL */
 
+#ifdef __DJGPP__
+#include <stdint.h>
+#undef HAVE_SYS_MMAN_H
+#endif // __DJGPP__
+
 #if defined(inhibit_libc)
 #define IN_LIBGCOV (-1)
 #else
diff --git a/libgfortran/intrinsics/chmod.c b/libgfortran/intrinsics/chmod.c
index 47502a7e9ec3..a9297ccb9de9 100644
--- a/libgfortran/intrinsics/chmod.c
+++ b/libgfortran/intrinsics/chmod.c
@@ -445,7 +445,7 @@ clause_done:
 	if ((ugo[2] || honor_umask) && !rwxXstugo[8])
 	  file_mode = (file_mode & ~(S_IROTH | S_IWOTH | S_IXOTH))
 		      | (new_mode & (S_IROTH | S_IWOTH | S_IXOTH));
-#ifndef __VXWORKS__
+#if !defined(__VXWORKS__) && !defined(__DJGPP__)
 	if (is_dir && rwxXstugo[5])
 	  file_mode |= S_ISVTX;
 	else if (!is_dir)
@@ -457,7 +457,7 @@ clause_done:
       {
 	/* Clear '-'.  */
 	file_mode &= ~new_mode;
-#if !defined( __MINGW32__) && !defined (__VXWORKS__)
+#if !defined( __MINGW32__) && !defined (__VXWORKS__) && !defined(__DJGPP__)
 	if (rwxXstugo[5] || !is_dir)
 	  file_mode &= ~S_ISVTX;
 #endif
@@ -465,7 +465,7 @@ clause_done:
     else if (set_mode == 3)
       {
 	file_mode |= new_mode;
-#if !defined (__MINGW32__) && !defined (__VXWORKS__)
+#if !defined (__MINGW32__) && !defined (__VXWORKS__) && !defined(__DJGPP__)
 	if (rwxXstugo[5] && is_dir)
 	  file_mode |= S_ISVTX;
 	else if (!is_dir)
diff --git a/libgfortran/intrinsics/execute_command_line.c b/libgfortran/intrinsics/execute_command_line.c
index 9bf009e0f620..0a5c6fbdd3f4 100644
--- a/libgfortran/intrinsics/execute_command_line.c
+++ b/libgfortran/intrinsics/execute_command_line.c
@@ -98,7 +98,7 @@ execute_command_line (const char *command, bool wait, int *exitstat,
 
       set_cmdstat (cmdstat, EXEC_NOERROR);
 
-#if defined(HAVE_SIGACTION) && defined(HAVE_WAITPID)
+#if defined(HAVE_SIGACTION) && defined(HAVE_WAITPID) && !defined(__DJGPP__)
       static bool sig_init_saved;
       bool sig_init = __atomic_load_n (&sig_init_saved, __ATOMIC_RELAXED);
       if (!sig_init)
diff --git a/libgfortran/io/unix.c b/libgfortran/io/unix.c
index 16600c855f2c..8ab0585ac74e 100644
--- a/libgfortran/io/unix.c
+++ b/libgfortran/io/unix.c
@@ -221,6 +221,9 @@ typedef struct
 }
 unix_stream;
 
+#ifdef __DJGPP__
+#include <io.h>
+#endif
 
 /* fix_fd()-- Given a file descriptor, make sure it is not one of the
    standard descriptors, returning a non-standard descriptor.  If the
@@ -1221,8 +1224,13 @@ tempfile_open (const char *tempdir, char **fname)
   char *template = xmalloc (tempdirlen + 23);
 
 #ifdef HAVE_MKSTEMP
+#ifdef __DJGPP__
+  /* Default filename is too long for DOS */
+  snprintf (template, tempdirlen + 23, "%s/gfXXXXXX", tempdir);
+#else
   snprintf (template, tempdirlen + 23, "%s%sgfortrantmpXXXXXX", 
 	    tempdir, slash);
+#endif
 
 #ifdef HAVE_UMASK
   /* Temporarily set the umask such that the file has 0600 permissions.  */
@@ -1588,6 +1596,13 @@ open_external (st_parameter_open *opp, unit_flags *flags)
     return NULL;
   fd = fix_fd (fd);
 
+#ifdef __DJGPP__
+  if (flags->form == FORM_UNFORMATTED)
+    {
+      setmode (fd, O_BINARY);
+    }
+#endif
+
   if (open_share (opp, fd, flags) < 0)
     return NULL;
 
diff --git a/libiberty/make-relative-prefix.c b/libiberty/make-relative-prefix.c
index 23920a8b282..9be3222a06c 100644
--- a/libiberty/make-relative-prefix.c
+++ b/libiberty/make-relative-prefix.c
@@ -65,6 +65,7 @@ relative prefix can be found, return @code{NULL}.
 
 #include "ansidecl.h"
 #include "libiberty.h"
+#include "filenames.h"
 
 #ifndef R_OK
 #define R_OK 4
@@ -340,7 +341,7 @@ make_relative_prefix_1 (const char *progname, const char *bin_prefix,
     {
       for (i = 0; i < bin_num; i++)
 	{
-	  if (strcmp (prog_dirs[i], bin_dirs[i]) != 0)
+	  if (FILENAME_CMP (prog_dirs[i], bin_dirs[i]) != 0)
 	    break;
 	}
 
@@ -356,7 +357,7 @@ make_relative_prefix_1 (const char *progname, const char *bin_prefix,
   n = (prefix_num < bin_num) ? prefix_num : bin_num;
   for (common = 0; common < n; common++)
     {
-      if (strcmp (bin_dirs[common], prefix_dirs[common]) != 0)
+      if (FILENAME_CMP (bin_dirs[common], prefix_dirs[common]) != 0)
 	break;
     }
 
diff --git a/libiberty/make-temp-file.c b/libiberty/make-temp-file.c
index 23b467035d5..15e03693c1b 100644
--- a/libiberty/make-temp-file.c
+++ b/libiberty/make-temp-file.c
@@ -52,6 +52,7 @@ Boston, MA 02110-1301, USA.  */
 #endif
 
 #include "libiberty.h"
+#include "filenames.h"
 extern int mkstemps (char *, int);
 
 /* '/' works just fine on MS-DOS based systems.  */
@@ -154,7 +155,8 @@ choose_tmpdir (void)
       len = strlen (base);
       tmpdir = XNEWVEC (char, len + 2);
       strcpy (tmpdir, base);
-      tmpdir[len] = DIR_SEPARATOR;
+      if (len>0 && !IS_DIR_SEPARATOR(tmpdir[len-1]))
+          tmpdir[len] = DIR_SEPARATOR;
       tmpdir[len+1] = '\0';
       memoized_tmpdir = tmpdir;
 #else /* defined(_WIN32) && !defined(__CYGWIN__) */
diff --git a/libiberty/simple-object-elf.c b/libiberty/simple-object-elf.c
index c09c216656c..fdd826a1aba 100644
--- a/libiberty/simple-object-elf.c
+++ b/libiberty/simple-object-elf.c
@@ -1293,7 +1293,9 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
     }
   if (new_i - 1 >= SHN_LORESERVE)
     {
+#ifdef ENOTSUP
       *err = ENOTSUP;
+#endif
       return "Too many copied sections";
     }
   eow->shdrs = XNEWVEC (unsigned char, shdr_size * (new_i - 1));
diff --git a/libquadmath/printf/quadmath-printf.h b/libquadmath/printf/quadmath-printf.h
index 32ebcec928cb..96498b7c4083 100644
--- a/libquadmath/printf/quadmath-printf.h
+++ b/libquadmath/printf/quadmath-printf.h
@@ -29,7 +29,8 @@ Boston, MA 02110-1301, USA.  */
 #ifdef HAVE_CTYPE_H
 #include <ctype.h>
 #endif
-#ifdef HAVE_WCHAR_H
+#if defined(HAVE_WCHAR_H) && !defined(__DJGPP__)
+/* DJGPP wchar.h is not good enough */
 #include <wchar.h>
 #endif
 #ifdef HAVE_WCTYPE_H
@@ -44,7 +45,7 @@ Boston, MA 02110-1301, USA.  */
 #include "quadmath-imp.h"
 #include "gmp-impl.h"
 
-#ifdef HAVE_WCHAR_H
+#if defined(HAVE_WCHAR_H) && !defined(__DJGPP__)
 #define L_(x) L##x
 #else
 #define L_(x) x
diff --git a/libstdc++-v3/config/os/djgpp/ctype_configure_char.cc b/libstdc++-v3/config/os/djgpp/ctype_configure_char.cc
index fc4fed3546c6..8dcc81460791 100644
--- a/libstdc++-v3/config/os/djgpp/ctype_configure_char.cc
+++ b/libstdc++-v3/config/os/djgpp/ctype_configure_char.cc
@@ -45,7 +45,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   ctype<char>::ctype(__c_locale, const mask* __table, bool __del,
 		     size_t __refs)
   : facet(__refs), _M_del(__table != 0 && __del),
-  _M_toupper(__dj_ctype_toupper), _M_tolower(__dj_ctype_tolower),
+  _M_toupper(__dj_ctype_toupper+1), _M_tolower(__dj_ctype_tolower+1),
   _M_table(__table ? __table : classic_table())
   {
     memset(_M_widen, 0, sizeof(_M_widen));
@@ -56,7 +56,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   ctype<char>::ctype(const mask* __table, bool __del, size_t __refs)
   : facet(__refs), _M_del(__table != 0 && __del),
-  _M_toupper(__dj_ctype_toupper), _M_tolower(__dj_ctype_tolower),
+  _M_toupper(__dj_ctype_toupper+1), _M_tolower(__dj_ctype_tolower+1),
   _M_table(__table ? __table : classic_table())
   {
     memset(_M_widen, 0, sizeof(_M_widen));
diff --git a/libstdc++-v3/config/os/djgpp/error_constants.h b/libstdc++-v3/config/os/djgpp/error_constants.h
index 758507fb126d..fa5c753e7b4c 100644
--- a/libstdc++-v3/config/os/djgpp/error_constants.h
+++ b/libstdc++-v3/config/os/djgpp/error_constants.h
@@ -33,16 +33,42 @@
 #include <bits/c++config.h>
 #include <cerrno>
 
+// Include Watt-32 errno list, if present
+#if defined __has_include && __has_include(<sys/werrno.h>)
+#include <sys/werrno.h>
+#endif
+
+#ifndef EOPNOTSUPP
+// Use same value as in wat3222br6.zip file net/watt/sys/djgpp.err
+#define EOPNOTSUPP 52
+#endif
+
+#ifndef ENOTSUP
+#define ENOTSUP 101
+#endif
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   enum class errc
     {
-//    address_family_not_supported = 		EAFNOSUPPORT,
-//    address_in_use = 				EADDRINUSE,
-//    address_not_available = 			EADDRNOTAVAIL,
-//    already_connected = 			EISCONN,
+#ifdef EAFNOSUPPORT
+      address_family_not_supported = 		EAFNOSUPPORT,
+#endif
+
+#ifdef EADDRINUSE
+      address_in_use = 				EADDRINUSE,
+#endif
+
+#ifdef EADDRNOTAVAIL
+      address_not_available = 			EADDRNOTAVAIL,
+#endif
+
+#ifdef EISCONN
+      already_connected = 			EISCONN,
+#endif
+
       argument_list_too_long = 			E2BIG,
       argument_out_of_domain = 			EDOM,
       bad_address = 				EFAULT,
@@ -53,12 +79,29 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif
 
       broken_pipe = 				EPIPE,
-//    connection_aborted = 			ECONNABORTED,
-//    connection_already_in_progress = 		EALREADY,
-//    connection_refused = 			ECONNREFUSED,
-//    connection_reset = 			ECONNRESET,
+
+#ifdef ECONNABORTED
+      connection_aborted = 			ECONNABORTED,
+#endif
+
+#ifdef EALREADY
+      connection_already_in_progress = 		EALREADY,
+#endif
+
+#ifdef ECONNREFUSED
+      connection_refused = 			ECONNREFUSED,
+#endif
+
+#ifdef ECONNRESET
+      connection_reset = 			ECONNRESET,
+#endif
+
       cross_device_link = 			EXDEV,
-//    destination_address_required = 		EDESTADDRREQ,
+
+#ifdef EDESTADDRREQ
+      destination_address_required = 		EDESTADDRREQ,
+#endif
+
       device_or_resource_busy = 		EBUSY,
       directory_not_empty = 			ENOTEMPTY,
       executable_format_error = 		ENOEXEC,
@@ -66,7 +109,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       file_too_large = 				EFBIG,
       filename_too_long = 			ENAMETOOLONG,
       function_not_supported = 			ENOSYS,
-//    host_unreachable = 			EHOSTUNREACH,
+
+#ifdef EHOSTUNREACH
+      host_unreachable = 			EHOSTUNREACH,
+#endif
 
 #ifdef EIDRM
       identifier_removed = 			EIDRM,
@@ -79,11 +125,27 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       invalid_seek = 				ESPIPE,
       io_error = 				EIO,
       is_a_directory = 				EISDIR,
-//    message_size = 				EMSGSIZE,
-//    network_down = 				ENETDOWN,
-//    network_reset = 				ENETRESET,
-//    network_unreachable = 			ENETUNREACH,
-//    no_buffer_space = 			ENOBUFS,
+
+#ifdef EMSGSIZE
+      message_size = 				EMSGSIZE,
+#endif
+
+#ifdef ENETDOWN
+      network_down = 				ENETDOWN,
+#endif
+
+#ifdef ENETRESET
+      network_reset = 				ENETRESET,
+#endif
+
+#ifdef ENETUNREACH
+      network_unreachable = 			ENETUNREACH,
+#endif
+
+#ifdef ENOBUFS
+      no_buffer_space = 			ENOBUFS,
+#endif
+
       no_child_process = 			ECHILD,
 
 #ifdef ENOLINK
@@ -96,8 +158,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       no_message_available = 			ENODATA,
 #endif
 
-//    no_message = 				ENOMSG,
-//    no_protocol_option = 			ENOPROTOOPT,
+#ifdef ENOMSG
+      no_message = 				ENOMSG,
+#endif
+
+#ifdef ENOPROTOOPT
+      no_protocol_option = 			ENOPROTOOPT,
+#endif
+
       no_space_on_device = 			ENOSPC,
 
 #ifdef ENOSR
@@ -109,13 +177,19 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       no_such_file_or_directory = 		ENOENT,
       no_such_process = 			ESRCH,
       not_a_directory = 			ENOTDIR,
-//    not_a_socket = 				ENOTSOCK,
+
+#ifdef ENOTSOCK
+      not_a_socket = 				ENOTSOCK,
+#endif
 
 #ifdef ENOSTR
       not_a_stream = 				ENOSTR,
 #endif
 
-//    not_connected = 				ENOTCONN,
+#ifdef ENOTCONN
+      not_connected = 				ENOTCONN,
+#endif
+
       not_enough_memory = 			ENOMEM,
 
 #ifdef ENOTSUP
@@ -126,10 +200,16 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       operation_canceled = 			ECANCELED,
 #endif
 
-//    operation_in_progress = 			EINPROGRESS,
+#ifdef EINPROGRESS
+      operation_in_progress = 			EINPROGRESS,
+#endif
+
       operation_not_permitted = 		EPERM,
-//    operation_not_supported = 		EOPNOTSUPP,
-//    operation_would_block = 			EWOULDBLOCK,
+      operation_not_supported = 		EOPNOTSUPP,
+
+#ifdef EWOULDBLOCK
+      operation_would_block = 			EWOULDBLOCK,
+#endif
 
 #ifdef EOWNERDEAD
       owner_dead = 				EOWNERDEAD,
@@ -141,7 +221,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       protocol_error = 				EPROTO,
 #endif
 
-//    protocol_not_supported = 			EPROTONOSUPPORT,
+#ifdef EPROTONOSUPPORT
+      protocol_not_supported = 			EPROTONOSUPPORT,
+#endif
+
       read_only_file_system = 			EROFS,
       resource_deadlock_would_occur = 		EDEADLK,
       resource_unavailable_try_again = 		EAGAIN,
@@ -159,7 +242,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       text_file_busy = 				ETXTBSY,
 #endif
 
-//    timed_out = 				ETIMEDOUT,
+#ifdef ETIMEDOUT
+      timed_out = 				ETIMEDOUT,
+#endif
+
       too_many_files_open_in_system = 		ENFILE,
       too_many_files_open = 			EMFILE,
       too_many_links = 				EMLINK,
@@ -169,7 +255,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       value_too_large = 			EOVERFLOW,
 #endif
 
-//    wrong_protocol_type = 			EPROTOTYPE
+#ifdef EPROTOTYPE
+      wrong_protocol_type = 			EPROTOTYPE
+#endif
     };
 
 _GLIBCXX_END_NAMESPACE_VERSION
diff --git a/libstdc++-v3/include/experimental/bits/fs_path.h b/libstdc++-v3/include/experimental/bits/fs_path.h
index 5008e26af8db..3591d6764be3 100644
--- a/libstdc++-v3/include/experimental/bits/fs_path.h
+++ b/libstdc++-v3/include/experimental/bits/fs_path.h
@@ -53,6 +53,11 @@
 # include <algorithm>
 #endif
 
+#if defined(__DJGPP__)
+# define _GLIBCXX_FILESYSTEM_IS_DJGPP 1
+# include <algorithm>
+#endif
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -515,6 +520,8 @@ namespace __detail
     {
 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
       return __ch == L'/' || __ch == preferred_separator;
+#elif defined(_GLIBCXX_FILESYSTEM_IS_DJGPP)
+      return __ch == '/' || __ch == '\\';
 #else
       return __ch == '/';
 #endif
@@ -1027,6 +1034,9 @@ namespace __detail
 #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
     std::replace(_M_pathname.begin(), _M_pathname.end(), L'/',
 		 preferred_separator);
+#elif defined(_GLIBCXX_FILESYSTEM_IS_DJGPP)
+    std::replace(_M_pathname.begin(), _M_pathname.end(), '\\',
+		 preferred_separator);
 #endif
     return *this;
   }
@@ -1249,7 +1259,7 @@ namespace __detail
   inline bool
   path::is_absolute() const
   {
-#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
+#if defined(_GLIBCXX_FILESYSTEM_IS_WINDOWS) || defined(_GLIBCXX_FILESYSTEM_IS_DJGPP)
     return has_root_name() && has_root_directory();
 #else
     return has_root_directory();
diff --git a/libstdc++-v3/src/filesystem/path.cc b/libstdc++-v3/src/filesystem/path.cc
index 7dbbd4402004..5a87bfe13dbc 100644
--- a/libstdc++-v3/src/filesystem/path.cc
+++ b/libstdc++-v3/src/filesystem/path.cc
@@ -411,8 +411,13 @@ path::_M_split_cmpts()
 	_M_add_root_dir(0);
       ++pos;
     }
-#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
+#if defined(_GLIBCXX_FILESYSTEM_IS_WINDOWS) \
+  || defined(_GLIBCXX_FILESYSTEM_IS_DJGPP)
+#ifdef __DJGPP__
+  else if (len > 1 && pathname[1] == ':')
+#else
   else if (len > 1 && pathname[1] == L':')
+#endif
     {
       // got disk designator
       if (len == 2)