--- zvbi/src/io.h.orig	2022-04-27 13:12:22.154124296 +0300
+++ zvbi/src/io.h	2022-04-27 13:12:54.706349113 +0300
@@ -28,6 +28,12 @@
 #include "decoder.h"
 #include "bit_slicer.h"
 
+#if defined(_WIN32) && defined(__has_include_next)
+# if __has_include_next(<io.h>)
+#  include_next <io.h>
+# endif
+#endif
+
 /* Public */
 
 #include <sys/time.h> /* struct timeval */
--- zvbi/src/io.c.orig	2022-04-21 14:52:30.294105422 +0300
+++ zvbi/src/io.c	2022-04-21 14:39:26.424663785 +0300
@@ -556,7 +556,6 @@
 		return ret;
 	}
 }
-#endif
 /* Helper functions to log the communication between the library and drivers.
    FIXME remove fp arg, call user log function instead (0.3). */
 
@@ -777,7 +776,6 @@
 	return err;
 }
 
-#ifndef _WIN32
 /**
  * @internal
  * Drop-in for mmap(). Logs the request on fp if not NULL.
@@ -827,7 +825,7 @@
 
 	return r;
 }
-#endif
+
 /**
  * @internal
  * Drop-in for munmap(). Logs the request on fp if not NULL.
@@ -860,6 +858,7 @@
 
 	return r;
 }
+#endif
 
 /*
 Local variables:
--- zvbi/src/page_table.c.orig	2022-04-21 14:52:22.018047995 +0300
+++ zvbi/src/page_table.c	2022-04-21 14:48:38.224494983 +0300
@@ -35,6 +35,17 @@
 #include "misc.h"
 #include "page_table.h"
 
+#ifdef _WIN32
+#include <intrin.h>
+static inline int ffs(int value) {
+	unsigned long index;
+	if (value == 0)
+		return 0;
+	_BitScanForward(&index, value);
+	return index + 1;
+}
+#endif
+
 /**
  * addtogroup PageTable Teletext Page Number Table
  * ingroup LowDec
--- zvbi/src/pdc.c.orig	2022-04-21 14:52:12.297980549 +0300
+++ zvbi/src/pdc.c	2022-04-21 14:51:40.529760109 +0300
@@ -35,6 +35,7 @@
 #include "pdc.h"
 #include "conv.h"
 
+#ifndef _WIN32
 /**
  * @addtogroup ProgramID VPS/PDC Program ID
  * @ingroup LowDec
@@ -1460,6 +1461,7 @@
 		}
 	}
 }
+#endif
 
 /*
 Local variables: