--- bash-4.4/bashline.c	2017-01-27 12:21:44.670146700 -0600
+++ bash-4.4/bashline.c	2017-01-27 13:11:50.793821100 -0600
@@ -76,6 +76,16 @@
 #  include "pcomplete.h"
 #endif
 
+#if __CYGWIN__
+#  ifdef __x86_64__
+#    define IMP(x) __imp_##x
+#  else
+#    define IMP(x) _imp__##x
+#  endif
+#else
+#  define IMP(x) x
+#endif
+
 /* These should agree with the defines for emacs_mode and vi_mode in
    rldefs.h, even though that's not a public readline header file. */
 #ifndef EMACS_EDITING_MODE
@@ -271,6 +281,11 @@ int no_empty_command_completion;
    are the only possible matches, even if FIGNORE says to. */
 int force_fignore = 1;
 
+#if __CYGWIN__
+/* If set, shorten "foo.exe" to "foo" when they are the same file.  */
+int completion_strip_exe;
+#endif /* __CYGWIN__ */
+
 /* Perform spelling correction on directory names during word completion */
 int dircomplete_spelling = 0;
 
@@ -498,11 +513,12 @@ initialize_readline ()
   kseq[0] = CTRL('J');
   kseq[1] = '\0';
   func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
-  if (func == rl_vi_editing_mode)
+  extern rl_command_func_t *IMP(rl_vi_editing_mode);
+  if (func == rl_vi_editing_mode || func == IMP(rl_vi_editing_mode))
     rl_unbind_key_in_map (CTRL('J'), emacs_meta_keymap);
   kseq[0] = CTRL('M');
   func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
-  if (func == rl_vi_editing_mode)
+  if (func == rl_vi_editing_mode || func == IMP(rl_vi_editing_mode))
     rl_unbind_key_in_map (CTRL('M'), emacs_meta_keymap);
 #if defined (VI_MODE)
   rl_unbind_key_in_map (CTRL('E'), vi_movement_keymap);
@@ -521,7 +537,8 @@ initialize_readline ()
   kseq[0] = '~';
   kseq[1] = '\0';
   func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
-  if (func == 0 || func == rl_tilde_expand)
+  extern rl_command_func_t *IMP(rl_tilde_expand);
+  if (func == 0 || func == rl_tilde_expand || func == IMP(rl_tilde_expand))
     rl_bind_keyseq_in_map (kseq, bash_complete_username, emacs_meta_keymap);
 
   rl_bind_key_if_unbound_in_map ('~', bash_possible_username_completions, emacs_ctlx_keymap);
@@ -544,7 +561,8 @@ initialize_readline ()
   kseq[0] = TAB;
   kseq[1] = '\0';
   func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
-  if (func == 0 || func == rl_tab_insert)
+  extern rl_command_func_t *IMP(rl_tab_insert);
+  if (func == 0 || func == rl_tab_insert || func == IMP(rl_tab_insert))
     rl_bind_key_in_map (TAB, dynamic_complete_history, emacs_meta_keymap);
 
   /* Tell the completer that we want a crack first. */
@@ -2194,6 +2212,21 @@ globword:
 
       if (match && executable_completion ((searching_path ? val : cval), searching_path))
 	{
+#if __CYGWIN__
+	  if (completion_strip_exe)
+	    {
+	      size_t val_len = strlen (val);
+	      char *candidate;
+	      if (val_len > 4 && !strcasecmp (&val[val_len - 4], ".exe")
+		  && (candidate = strdup (val)))
+		{
+		  candidate[val_len - 4] = '\0';
+		  if (same_file (val, candidate, NULL, NULL))
+		    temp[strlen (temp) - 4] = '\0';
+		  free (candidate);
+		}
+	    }
+#endif
 	  if (cval != val)
 	    free (cval);
 	  free (val);
@@ -2929,6 +2962,17 @@ test_for_directory (name)
   int r;
 
   fn = bash_tilde_expand (name, 0);
+#if __CYGWIN
+  /* stat("//server") can only be successful as a directory, but can take
+     seconds to time out on failure.  It is much faster to assume that
+     "//server" is a valid name than it is to wait for a stat, even if it
+     gives false positives on bad names.  */
+  if (fn[0] == '/' && fn[1] == '/' && ! strchr (&fn[2], '/'))
+    {
+      free (fn);
+      return 1;
+    }
+#endif
   r = file_isdir (fn);
   free (fn);
 
--- bash-4.4/builtins/read.def	2017-01-27 12:21:44.732540800 -0600
+++ bash-4.4/builtins/read.def	2017-01-27 13:11:50.793821100 -0600
@@ -85,7 +85,6 @@ $END
 
 #ifdef __CYGWIN__
 #  include <fcntl.h>
-#  include <io.h>
 #endif
 
 #include "../bashintl.h"
@@ -530,10 +529,6 @@ read_builtin (list)
       fflush (stderr);
     }
 
-#if defined (__CYGWIN__) && defined (O_TEXT)
-  setmode (0, O_TEXT);
-#endif
-
   ps2 = 0;
   for (print_ps2 = eof = retval = 0;;)
     {
@@ -664,6 +659,14 @@ read_builtin (list)
       if (c == '\0' && delim != '\0')
 	continue;		/* skip NUL bytes in input */
 
+#ifdef __CYGWIN__
+      {
+        extern igncr;
+	if (igncr && c == '\r' && delim != '\r')
+	  continue; /* skip carriage return */
+      }
+#endif
+
       if ((skip_ctlesc == 0 && c == CTLESC) || (skip_ctlnul == 0 && c == CTLNUL))
 	{
 	  saw_escape++;
--- bash-5.1/builtins/set.def.orig	2020-08-03 20:31:43.000000000 +0200
+++ bash-5.1/builtins/set.def	2020-12-19 16:38:45.649368400 +0100
@@ -85,6 +85,9 @@
 #if defined (HISTORY)
           history      enable command history
 #endif
+#ifdef __CYGWIN__
+          igncr        on Cygwin, ignore \r in line endings
+#endif
           ignoreeof    the shell will not exit upon reading EOF
           interactive-comments
                        allow comments to appear in interactive commands
@@ -176,6 +179,14 @@
 
 static int previous_option_value;
 
+#ifdef __CYGWIN__
+extern int igncr;
+static int set_minus_o_option_maybe (int, const char *, int);
+#  define INTERACTIVE_ONLY ,1
+#else
+#  define INTERACTIVE_ONLY
+#endif
+
 /* A struct used to match long options for set -o to the corresponding
    option letter or internal variable.  The functions can be called to
    dynamically generate values.  If you add a new variable name here
@@ -187,29 +198,39 @@
   int *variable;
   setopt_set_func_t *set_func;
   setopt_get_func_t *get_func;
+#ifdef __CYGWIN__
+  /* Cygwin users have taken to exporting SHELLOPTS for the cygwin-specific
+     igncr. As a result, we want to ensure SHELLOPTS parsing does not turn
+     on interactive options when exported from an interactive shell, but
+     parse in a non-interactive setting, so as not to break POSIX /bin/sh */
+  int interactive_only;
+#endif
 } o_options[] = {
   { "allexport",  'a', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
 #if defined (BRACE_EXPANSION)
   { "braceexpand",'B', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
 #endif
 #if defined (READLINE)
-  { "emacs",     '\0', (int *)NULL, set_edit_mode, get_edit_mode },
+  { "emacs",     '\0', (int *)NULL, set_edit_mode, get_edit_mode INTERACTIVE_ONLY },
 #endif
   { "errexit",	  'e', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
   { "errtrace",	  'E', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
   { "functrace",  'T', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
   { "hashall",    'h', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
 #if defined (BANG_HISTORY)
-  { "histexpand", 'H', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
+  { "histexpand", 'H', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL INTERACTIVE_ONLY },
 #endif /* BANG_HISTORY */
 #if defined (HISTORY)
-  { "history",   '\0', &enable_history_list, bash_set_history, (setopt_get_func_t *)NULL },
+  { "history",   '\0', &enable_history_list, bash_set_history, (setopt_get_func_t *)NULL INTERACTIVE_ONLY },
+#endif
+#ifdef __CYGWIN__
+  { "igncr", '\0', &igncr, NULL, (setopt_get_func_t *)NULL },
 #endif
   { "ignoreeof", '\0', &ignoreeof, set_ignoreeof, (setopt_get_func_t *)NULL },
   { "interactive-comments", '\0', &interactive_comments, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
   { "keyword",    'k', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
 #if defined (JOB_CONTROL)
-  { "monitor",	  'm', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
+  { "monitor",	  'm', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL INTERACTIVE_ONLY },
 #endif
   { "noclobber",  'C', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
   { "noexec",	  'n', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
@@ -228,7 +249,7 @@
   { "privileged", 'p', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
   { "verbose",	  'v', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
 #if defined (READLINE)
-  { "vi",        '\0', (int *)NULL, set_edit_mode, get_edit_mode },
+  { "vi",        '\0', (int *)NULL, set_edit_mode, get_edit_mode INTERACTIVE_ONLY },
 #endif
   { "xtrace",	  'x', (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL  },
   {(char *)NULL, 0 , (int *)NULL, (setopt_set_func_t *)NULL, (setopt_get_func_t *)NULL },
@@ -486,6 +507,15 @@
 set_minus_o_option (on_or_off, option_name)
      int on_or_off;
      char *option_name;
+#ifdef __CYGWIN__
+{
+  /* See Cygwin comments above. */
+  return set_minus_o_option_maybe (on_or_off, option_name, 0);
+}
+static int
+set_minus_o_option_maybe (int on_or_off, const char *option_name,
+                          int avoid_interactive)
+#endif /* __CYGWIN__ */
 {
   register int i;
 
@@ -496,6 +526,10 @@
       return (EX_USAGE);
     }
 
+#ifdef __CYGWIN__
+	  if (o_options[i].interactive_only && avoid_interactive)
+	    return EXECUTION_SUCCESS;
+#endif
   if (o_options[i].letter == 0)
     {
       previous_option_value = GET_BINARY_O_OPTION_VALUE (i, o_options[i].name);
@@ -616,7 +650,11 @@
   vptr = 0;
   while (vname = extract_colon_unit (value, &vptr))
     {
+#ifdef __CYGWIN__
+      set_minus_o_option_maybe (FLAG_ON, vname, !interactive_shell);
+#else
       set_minus_o_option (FLAG_ON, vname);
+#endif
       free (vname);
     }
 }
--- bash-5.1/builtins/shopt.def.orig	2020-12-19 16:11:42.347711100 +0100
+++ bash-5.1/builtins/shopt.def	2020-12-19 16:11:50.709182800 +0100
@@ -94,6 +94,10 @@
 extern int localvar_inherit;
 extern int localvar_unset;
 
+#ifdef __CYGWIN__
+extern int completion_strip_exe;
+#endif
+
 #if defined (EXTENDED_GLOB)
 extern int extended_glob;
 #endif
@@ -182,6 +186,9 @@
   { "compat42", &shopt_compat42, set_compatibility_level },
   { "compat43", &shopt_compat43, set_compatibility_level },
   { "compat44", &shopt_compat44, set_compatibility_level },
+#ifdef __CYGWIN__
+  { "completion_strip_exe", &completion_strip_exe, NULL },
+#endif
 #if defined (READLINE)
   { "complete_fullquote", &complete_fullquote, (shopt_set_func_t *)NULL},
   { "direxpand", &dircomplete_expand, shopt_set_complete_direxpand },
--- bash-4.4/config-top.h	2016-05-19 13:34:02.000000000 -0500
+++ bash-4.4/config-top.h	2017-01-27 13:11:50.793821100 -0600
@@ -87,10 +87,10 @@
 #define DEFAULT_BASHRC "~/.bashrc"
 
 /* System-wide .bashrc file for interactive shells. */
-/* #define SYS_BASHRC "/etc/bash.bashrc" */
+#define SYS_BASHRC "/etc/bash.bashrc"
 
 /* System-wide .bash_logout for login shells. */
-/* #define SYS_BASH_LOGOUT "/etc/bash.bash_logout" */
+#define SYS_BASH_LOGOUT "/etc/bash.bash_logout"
 
 /* Define this to make non-interactive shells begun with argv[0][0] == '-'
    run the startup files when not in posix mode. */
@@ -100,7 +100,7 @@
    sshd and source the .bashrc if so (like the rshd behavior).  This checks
    for the presence of SSH_CLIENT or SSH2_CLIENT in the initial environment,
    which can be fooled under certain not-uncommon circumstances. */
-/* #define SSH_SOURCE_BASHRC */
+#define SSH_SOURCE_BASHRC
 
 /* Define if you want the case-capitalizing operators (~[~]) and the
    `capcase' variable attribute (declare -c). */
--- bash-4.4/doc/Makefile.in	2015-12-06 18:55:56.000000000 -0600
+++ bash-4.4/doc/Makefile.in	2017-01-27 13:11:50.793821100 -0600
@@ -189,7 +189,7 @@ bashref.html: $(BASHREF_FILES) $(HSUSER)
 	$(MAKEINFO) --html --no-split -I$(TEXINPUTDIR) $(srcdir)/bashref.texi
 
 bash.info: bashref.info
-	${SHELL} ${INFOPOST} < $(srcdir)/bashref.info > $@ ; \
+	${SHELL} ${INFOPOST} < bashref.info > $@ ; \
 
 bash.txt: bash.1
 bash.ps: bash.1
@@ -252,9 +252,9 @@ install: info installdirs
 	-$(INSTALL_DATA) $(srcdir)/bashbug.1 $(DESTDIR)$(man1dir)/bashbug${man1ext}
 	-$(INSTALL_DATA) $(OTHER_DOCS) $(DESTDIR)$(docdir)
 # uncomment the next lines to install the builtins man page
-#	sed 's:bash\.1:man1/&:' $(srcdir)/builtins.1 > $${TMPDIR:-/var/tmp}/builtins.1
-#	-$(INSTALL_DATA) $${TMPDIR:-/var/tmp}/builtins.1 $(DESTDIR)$(man1dir)/bash_builtins${man1ext}
-#	-$(RM) $${TMPDIR:-/var/tmp}/builtins.1
+	sed 's:bash\.1:man1/&:' $(srcdir)/builtins.1 > $${TMPDIR:-/var/tmp}/builtins.1
+	-$(INSTALL_DATA) $${TMPDIR:-/var/tmp}/builtins.1 $(DESTDIR)$(man1dir)/bash_builtins${man1ext}
+	-$(RM) $${TMPDIR:-/var/tmp}/builtins.1
 	-if test -f bash.info; then d=.; else d=$(srcdir); fi; \
 	  $(INSTALL_DATA) $$d/bash.info $(DESTDIR)$(infodir)/bash.info
 # run install-info if it is present to update the info directory
--- bash-4.4/doc/bash.1	2016-08-26 08:45:17.000000000 -0500
+++ bash-4.4/doc/bash.1	2017-01-27 13:11:50.809402700 -0600
@@ -9607,6 +9607,10 @@ filenames.
 This variable is set by default, which is the default bash behavior in
 versions through 4.2.
 .TP 8
+.B completion_strip_exe
+If set, whenever bash sees \fIfoo.exe\fP during completion, it checks if
+\fIfoo\fP is the same file and strips the suffix.
+.TP 8
 .B direxpand
 If set,
 .B bash
--- bash-4.4/doc/bashref.texi	2016-09-07 16:13:36.000000000 -0500
+++ bash-4.4/doc/bashref.texi	2017-01-27 13:11:50.809402700 -0600
@@ -5123,6 +5123,10 @@ filenames.
 This variable is set by default, which is the default Bash behavior in
 versions through 4.2.
 
+@item completion_strip_exe
+If set, whenever bash sees @file{foo.exe} during completion, it checks if
+@file{foo} is the same file and strips the suffix.
+
 @item direxpand
 If set, Bash
 replaces directory names with the results of word expansion when performing
--- bash-4.4/doc/builtins.1	2012-02-21 13:32:05.000000000 -0600
+++ bash-4.4/doc/builtins.1	2017-01-27 13:11:50.809402700 -0600
@@ -19,6 +19,6 @@ shift, shopt, source, suspend, test, tim
 ulimit, umask, unalias, unset, wait \- bash built-in commands, see \fBbash\fR(1)
 .SH BASH BUILTIN COMMANDS
 .nr zZ 1
-.so bash.1
+.so man1/bash.1
 .SH SEE ALSO
 bash(1), sh(1)
--- bash-5.1/general.c.orig	2020-07-28 20:35:53.000000000 +0200
+++ bash-5.1/general.c	2020-12-19 16:06:23.582528400 +0100
@@ -54,6 +54,10 @@
 
 #include <tilde/tilde.h>
 
+#ifdef __CYGWIN__
+# include <sys/cygwin.h>
+#endif
+
 #if !defined (errno)
 extern int errno;
 #endif /* !errno */
@@ -830,7 +834,7 @@
       char pathbuf[PATH_MAX + 1];
 
       /* WAS cygwin_conv_to_full_posix_path (string, pathbuf); */
-      cygwin_conv_path (CCP_WIN_A_TO_POSIX, string, pathbuf, PATH_MAX);
+      cygwin_conv_path (CCP_WIN_A_TO_POSIX | CCP_ABSOLUTE, string, pathbuf, PATH_MAX);
       result = savestring (pathbuf);
     }
 #else
--- bash-4.4/input.c	2015-09-24 18:49:23.000000000 -0500
+++ bash-4.4/input.c	2017-01-27 13:11:50.809402700 -0600
@@ -44,6 +44,10 @@
 #include "quit.h"
 #include "trap.h"
 
+#ifdef __CYGWIN__
+int igncr;
+#endif
+
 #if !defined (errno)
 extern int errno;
 #endif /* !errno */
@@ -561,6 +565,19 @@ buffered_getchar ()
 {
   CHECK_TERMSIG;
 
+#ifdef __CYGWIN__
+  /* shopt igncr discards carriage returns from the input stream.
+     If cr is the only character left in the buffer, recurse to pick
+     up the next byte; otherwise flatten the buffer.  */
+  if (igncr)
+    {
+      int ch;
+      while ((ch = bufstream_getc (buffers[bash_input.location.buffered_fd]))
+	     == '\r')
+	;
+      return ch;
+    }
+#endif
 #if !defined (DJGPP)
   return (bufstream_getc (buffers[bash_input.location.buffered_fd]));
 #else
--- bash-4.4/lib/sh/pathphys.c	2013-05-28 14:33:58.000000000 -0500
+++ bash-4.4/lib/sh/pathphys.c	2017-01-27 13:11:50.809402700 -0600
@@ -35,6 +35,7 @@
 #include <stdio.h>
 #include <chartypes.h>
 #include <errno.h>
+#include <stdlib.h>
 
 #include "shell.h"
 
@@ -76,6 +77,9 @@ sh_physpath (path, flags)
      char *path;
      int flags;
 {
+#ifdef __CYGWIN__
+  return realpath (path, NULL);
+#endif
   char tbuf[PATH_MAX+1], linkbuf[PATH_MAX+1];
   char *result, *p, *q, *qsave, *qbase, *workpath;
   int double_slash_path, linklen, nlink;
@@ -214,11 +218,7 @@ error:
 	    {
 	      q = result;
 	      /* Duplicating some code here... */
-#if defined (__CYGWIN__)
-	      qbase = (ISALPHA((unsigned char)workpath[0]) && workpath[1] == ':') ? workpath + 3 : workpath + 1;
-#else
 	      qbase = workpath + 1;
-#endif
 	      double_slash_path = DOUBLE_SLASH (workpath);
 	      qbase += double_slash_path;
     
--- bash-4.4/lib/sh/tmpfile.c	2016-08-11 10:05:58.000000000 -0500
+++ bash-4.4/lib/sh/tmpfile.c	2017-01-27 13:11:50.809402700 -0600
@@ -101,7 +101,7 @@ get_tmpdir (flags)
   if (tdir && (file_iswdir (tdir) == 0 || strlen (tdir) > PATH_MAX))
     tdir = 0;
 
-  if (tdir == 0)
+  if (tdir == 0 || !file_iswdir (tdir))
     tdir = get_sys_tmpdir ();
 
 #if defined (HAVE_PATHCONF) && defined (_PC_NAME_MAX)
--- bash-4.4/mksyntax.c	2012-07-29 18:48:38.000000000 -0500
+++ bash-4.4/mksyntax.c	2017-01-27 13:11:50.809402700 -0600
@@ -29,13 +29,13 @@
 
 #ifdef HAVE_UNISTD_H
 #  include <unistd.h>
+#else
+extern int optind;
+extern char *optarg;
 #endif
 
 #include "syntax.h"
 
-extern int optind;
-extern char *optarg;
-
 #ifndef errno
 extern int errno;
 #endif
--- bash-4.4/parse.y	2016-09-11 10:31:46.000000000 -0500
+++ bash-4.4/parse.y	2017-01-27 13:11:50.809402700 -0600
@@ -1539,14 +1539,20 @@ yy_string_get ()
   string = bash_input.location.string;
 
   /* If the string doesn't exist, or is empty, EOF found. */
-  if (string && *string)
+  while (string && *string)
     {
       c = *string++;
       bash_input.location.string = string;
+#ifdef __CYGWIN__
+      {
+	extern int igncr;
+	if (igncr && c == '\r')
+	  continue;
+      }
+#endif
       return (c);
     }
-  else
-    return (EOF);
+  return (EOF);
 }
 
 static int
--- bash-5.1/subst.c.orig	2020-11-16 16:33:15.000000000 +0100
+++ bash-5.1/subst.c	2020-12-19 16:56:42.074812800 +0100
@@ -43,6 +43,7 @@
 #include "posixstat.h"
 #include "bashintl.h"
 
+#define NEED_SH_SETLINEBUF_DECL
 #include "shell.h"
 #include "parser.h"
 #include "flags.h"
@@ -6216,6 +6217,13 @@
 #endif
 	  continue;
 	}
+#ifdef __CYGWIN__
+      {
+	extern int igncr;
+	if (igncr && c == '\r')
+	  continue;
+      }
+#endif
 
       /* Add the character to ISTRING, possibly after resizing it. */
       RESIZE_MALLOCED_BUFFER (istring, istring_index, mb_cur_max+1, istring_size, 512);
@@ -6354,6 +6371,28 @@
       goto error_exit;
     }
 
+#ifdef __CYGWIN__
+  /* Passing a pipe through std fds can cause hangs when talking to a
+     non-cygwin child.  Move it.  */
+  if (fildes[0] < 3)
+    {
+      int fd = fcntl (fildes[0], F_DUPFD, 3);
+      close (fildes[0]);
+      fildes[0] = fd;
+    }
+  if (fildes[1] < 3)
+    {
+      int fd = fcntl (fildes[1], F_DUPFD, 3);
+      close (fildes[1]);
+      fildes[1] = fd;
+    }
+  if (fildes[0] < 0 || fildes[1] < 0)
+    {
+      sys_error (_("cannot make pipe for command substitution"));
+      goto error_exit;
+    }
+#endif /* __CYGWIN__ */
+
 #if defined (JOB_CONTROL)
   old_pipeline_pgrp = pipeline_pgrp;
   /* Don't reset the pipeline pgrp if we're already a subshell in a pipeline. */
--- bash-4.4/support/bashversion.c	2008-09-09 08:31:53.000000000 -0500
+++ bash-4.4/support/bashversion.c	2017-01-27 13:11:50.809402700 -0600
@@ -26,6 +26,9 @@
 
 #if defined (HAVE_UNISTD_H)
 #  include <unistd.h>
+#else
+extern int optind;
+extern char *optarg;
 #endif
 
 #include "bashansi.h"
@@ -41,9 +44,6 @@
 #define LFLAG	0x0020
 #define XFLAG	0x0040
 
-extern int optind;
-extern char *optarg;
-
 extern char *dist_version;
 extern int patch_level;
 
--- bash-4.4/support/mkversion.sh	2008-08-13 07:25:57.000000000 -0500
+++ bash-4.4/support/mkversion.sh	2017-01-27 13:11:50.809402700 -0600
@@ -29,7 +29,7 @@ source_dir="."
 while [ $# -gt 0 ]; do
 	case "$1" in
 	-o)	shift; OUTFILE=$1; shift ;;
-	-b)	shift; inc_build=yes ;;
+	-b)	shift; ;; # inc_build=yes ;; # hacked out for cygport
 	-s)	shift; rel_status=$1; shift ;;
 	-p)	shift; patch_level=$1; shift ;;
 	-d)	shift; dist_version=$1; shift ;;
--- bash-4.4/variables.c	2016-06-15 15:05:52.000000000 -0500
+++ bash-4.4/variables.c	2017-01-27 13:11:50.809402700 -0600
@@ -5239,6 +5239,7 @@ sv_winsize (name)
 /* Update the value of HOME in the export environment so tilde expansion will
    work on cygwin. */
 #if defined (__CYGWIN__)
+void
 sv_home (name)
      char *name;
 {
