--- tiff/libtiff/tif_win32.c.winstore	2019-03-07 11:51:43.944778200 +0100
+++ tiff/libtiff/tif_win32.c	2019-03-07 11:58:04.931465200 +0100
@@ -56,6 +56,7 @@
 #include "tiffiop.h"
 
 #include <windows.h>
+#include <winapifamily.h>
 
 static tmsize_t
 _tiffReadProc(thandle_t fd, void* buf, tmsize_t size)
@@ -181,6 +182,7 @@ _tiffDummyMapProc(thandle_t fd, void** p
 static int
 _tiffMapProc(thandle_t fd, void** pbase, toff_t* psize)
 {
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
 	uint64 size;
 	tmsize_t sizem;
 	HANDLE hMapFile;
@@ -201,6 +203,9 @@ _tiffMapProc(thandle_t fd, void** pbase,
 		return (0);
 	*psize = size;
 	return(1);
+#else
+	return(0);
+#endif
 }
 
 static void
@@ -235,8 +240,12 @@ TIFFFdOpen(int ifd, const char* name, co
 	{
 		if (mode[m]=='u')
 		{
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
 			fSuppressMap=1;
 			break;
+#else
+			return NULL;
+#endif
 		}
 	}
 	tif = TIFFClientOpen(name, mode, (thandle_t)ifd, /* FIXME: WIN64 cast to pointer warning */