--- src/argparse.c	2021-11-03 13:44:56.000000000 +0100
+++ src/argparse.c~	2022-01-03 17:05:23.418077200 +0100
@@ -33,8 +33,12 @@
 #include <stdarg.h>
 #include <limits.h>
 #include <errno.h>
-#include <unistd.h>
 #include <time.h>
+#ifdef _WIN32
+# define R_OK 04
+# define strncasecmp _strnicmp
+# define strcasecmp _stricmp
+#endif
 
 #include "gpgrt-int.h"
 
--- src/gpg-error.c	2020-06-06 00:18:40.199791000 +0200
+++ src/gpg-error.c~	2020-06-05 18:44:14.223182300 +0200
@@ -61,6 +61,11 @@
 #define drop_locale_dir(dir)
 #endif
 
+#ifdef _WIN32
+# define strncasecmp _strnicmp
+# define strcasecmp _stricmp
+#endif
+
 static void
 i18n_init (void)
 {

--- src/spawn-w32.c~  2022-01-03 16:33:24.000000000 +0100
+++ src/spawn-w32.c	  2022-01-03 16:46:57.173841200 +0100
@@ -56,7 +56,7 @@
  * Previous versions interpreted X_OK as F_OK anyway, so we'll just
  * use F_OK directly. */
 #undef X_OK
+#define X_OK 0
-#define X_OK F_OK
 
 /* For HANDLE and the internal file descriptor (fd) of this module:
  * HANDLE can be represented by an intptr_t which should be true for

--- src/logging.c	2020-06-05 18:58:59.254413200 +0200
+++ src/logging.c~	2019-12-12 15:23:37.000000000 +0100
@@ -44,7 +44,12 @@
 # include <netinet/in.h>
 # include <arpa/inet.h>
 #endif /*!HAVE_W32_SYSTEM*/
+#ifdef _WIN32
+# include <io.h>
+# include <process.h>
+#else
+# include <unistd.h>
+#endif
-#include <unistd.h>
 #include <fcntl.h>
 /* #include <execinfo.h> */
 
@@ -57,6 +53,15 @@
 
 
 #ifdef HAVE_W32_SYSTEM
+# ifndef  S_IRUSR
+#  define S_IRUSR _S_IREAD
+# endif
+# ifndef  S_IWUSR
+#  define S_IWUSR _S_IWRITE
+# endif
+# ifndef  S_IXUSR
+#  define S_IXUSR 0x00400000
+# endif
 # ifndef S_IRWXG
 #  define S_IRGRP S_IRUSR
 #  define S_IWGRP S_IWUSR
--- src/Makefile.am	2020-06-06 01:01:31.931459300 +0200
+++ src/Makefile.am~	2020-02-06 18:39:06.000000000 +0100
@@ -213,7 +213,7 @@
 # without the extra_cppflags because they may include am -idirafter
 # which is not supported by the RC compiler.
 libgpg_error_la_CPPFLAGS = -DLOCALEDIR=\"$(localedir)\" $(extra_cppflags)
+libgpg_error_la_LIBADD = $(gpg_error_res) $(intllibs) $(socklibs) -ladvapi32 $(LIBTHREAD)
-libgpg_error_la_LIBADD = $(gpg_error_res) $(intllibs) $(socklibs) $(LIBTHREAD)
 
 gpg_error_SOURCES = strsource-sym.c strerror-sym.c gpg-error.c
 gpg_error_CPPFLAGS = -DPKGDATADIR=\"$(pkgdatadir)\" \
--- src/Makefile.in	2020-06-06 01:01:31.931459300 +0200
+++ src/Makefile.in~	2020-02-06 18:39:06.000000000 +0100
@@ -659,7 +659,7 @@
 # without the extra_cppflags because they may include am -idirafter
 # which is not supported by the RC compiler.
 libgpg_error_la_CPPFLAGS = -DLOCALEDIR=\"$(localedir)\" $(extra_cppflags)
+libgpg_error_la_LIBADD = $(gpg_error_res) $(intllibs) $(socklibs) -ladvapi32 $(LIBTHREAD)
-libgpg_error_la_LIBADD = $(gpg_error_res) $(intllibs) $(socklibs) $(LIBTHREAD)
 gpg_error_SOURCES = strsource-sym.c strerror-sym.c gpg-error.c
 gpg_error_CPPFLAGS = -DPKGDATADIR=\"$(pkgdatadir)\" \
                      -DLOCALEDIR=\"$(localedir)\" $(extra_cppflags)
--- src/sysutils.c	2020-06-06 00:23:52.457265500 +0200
+++ src/sysutils.c~	2019-12-12 15:23:37.000000000 +0100
@@ -22,7 +22,11 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
+#ifdef _WIN32
+# include <io.h>
+#else
+# include <unistd.h>
+#endif
-#include <unistd.h>
 #include <errno.h>
 #ifdef HAVE_W32_SYSTEM
 # include <windows.h>
--- src/visibility.c	2020-06-05 18:54:56.410442900 +0200
+++ src/visibility.c~	2019-01-04 12:56:54.000000000 +0100
@@ -1067,11 +1067,7 @@
 _gpgrt_log_assert (const char *expr, const char *file,
                    int line, const char *func)
 {
-#ifdef GPGRT_HAVE_MACRO_FUNCTION
   _gpgrt__log_assert (expr, file, line, func);
-#else
-  _gpgrt__log_assert (expr, file, line);
-#endif
 }
 
 
--- src/w32-add.h	2020-06-06 00:32:38.502203300 +0200
+++ src/w32-add.h~	2018-12-07 14:48:19.000000000 +0100
@@ -65,3 +65,5 @@
 char *gpgrt_w32_reg_query_string (const char *root,
                                   const char *dir,
                                   const char *name);
+
+wchar_t *utf8_to_wchar (const char *string, size_t length, size_t *retlen);
--- src/w32-gettext.c	2020-06-06 00:33:24.680341900 +0200
+++ src/w32-gettext.c~	2020-06-05 18:44:14.254481700 +0200
@@ -1355,7 +1355,7 @@
    is not defined.  If LENGTH is zero and RETLEN NULL the fucntion
    assumes that STRING is a nul-terminated string and returns a
    (wchar_t)0-terminated string.  */
+wchar_t *
-static wchar_t *
 utf8_to_wchar (const char *string, size_t length, size_t *retlen)
 {
   int n;