When manually compiling FreeFileSync, you should also fix the following bugs in its library dependencies.
FreeFileSync generally uses the latest library versions and works with upstream to get the bugs fixed
that affect FreeFileSync. Therefore it is NOT RECOMMENDED TO COMPILE AGAINST OLDER library versions than
the ones mentioned below. The remaining issues that are yet to be fixed are listed in the following:


----------------
| libcurl 7.73 |
----------------
__________________________________________________________________________________________________________
/lib/ftp.c
https://github.com/curl/curl/issues/1455

+	static bool is_routable_ip_v4(unsigned int ip[4])
+	{
+		if (ip[0] == 127 || //127.0.0.0/8 (localhost)
+			ip[0] == 10  || //10.0.0.0/8 (private)
+			(ip[0] == 192 && ip[1] == 168) ||  //192.168.0.0/16 (private)
+			(ip[0] == 169 && ip[1] == 254) ||  //169.254.0.0/16 (link-local)
+			(ip[0] == 172 && ip[1] / 16 == 1)) //172.16.0.0/12 (private)
+			return false;
+		return true;
+	}


- if (data->set.ftp_skip_ip)
+	bool skipIp = data->set.ftp_skip_ip;
+	if (!skipIp && !is_routable_ip_v4(ip))
+	{
+		unsigned int ip_ctrl[4];
+		if (4 != sscanf(control_address(conn), "%u.%u.%u.%u",
+						&ip_ctrl[0], &ip_ctrl[1], &ip_ctrl[2], &ip_ctrl[3]) ||
+			is_routable_ip_v4(ip_ctrl))
+			skipIp = true;
+	}
+
+	if (skipIp)

__________________________________________________________________________________________________________
/lib/ftp.c
https://github.com/curl/curl/issues/4342

- result = ftp_nb_type(conn, TRUE, FTP_LIST_TYPE);
+ result = ftp_nb_type(conn, data->set.prefer_ascii, FTP_LIST_TYPE);

__________________________________________________________________________________________________________
/lib/multi.c
/lib/multihandle.h
https://github.com/curl/curl/issues/6146

remove patch! regression for Windows upload performance
__________________________________________________________________________________________________________


--------------------------
| libssh2 1.9.0-20201014 |
--------------------------
__________________________________________________________________________________________________________
src/session.c
memory leak: https://github.com/libssh2/libssh2/issues/28

-if (session->state & LIBSSH2_STATE_NEWKEYS)
+//if (session->state & LIBSSH2_STATE_NEWKEYS)

__________________________________________________________________________________________________________
move the following constants from src/sftp.h to include/libssh2_sftp.h:
	#define MAX_SFTP_OUTGOING_SIZE 30000
	#define MAX_SFTP_READ_SIZE 30000

__________________________________________________________________________________________________________


-------------------
| wxWidgets 3.1.4 |
-------------------
__________________________________________________________________________________________________________
/include/wx/window.h
wxWidgets/GTK2 on some Linux systems incorrectly detects high DPI: https://freefilesync.org/forum/viewtopic.php?t=6114
=> hack away high-DPI support for GTK2 (= pretend GTK2 has device independent pixels, which it clearly has not!)

    #include "wx/gtk/window.h"
-   #ifdef __WXGTK3__
+    //#ifdef __WXGTK3__
        #define wxHAVE_DPI_INDEPENDENT_PIXELS
-   #endif
+	//#endif
__________________________________________________________________________________________________________
/src/aui/framemanager.cpp:
Fix incorrect pane height calculations:

-        // determine the dock's minimum size
-        bool plus_border = false;
-        bool plus_caption = false;
-        int dock_min_size = 0;
-        for (j = 0; j < dock_pane_count; ++j)
-        {
-            wxAuiPaneInfo& pane = *dock.panes.Item(j);
-            if (pane.min_size != wxDefaultSize)
-            {
-                if (pane.HasBorder())
-                    plus_border = true;
-                if (pane.HasCaption())
-                    plus_caption = true;
-                if (dock.IsHorizontal())
-                {
-                    if (pane.min_size.y > dock_min_size)
-                        dock_min_size = pane.min_size.y;
-                }
-                else
-                {
-                    if (pane.min_size.x > dock_min_size)
-                        dock_min_size = pane.min_size.x;
-                }
-            }
-        }
-
-        if (plus_border)
-            dock_min_size += (pane_borderSize*2);
-        if (plus_caption && dock.IsHorizontal())
-            dock_min_size += (caption_size);
-
-        dock.min_size = dock_min_size;

+        // determine the dock's minimum size
+        int dock_min_size = 0;
+       for (j = 0; j < dock_pane_count; ++j)
+        {
+            wxAuiPaneInfo& pane = *dock.panes.Item(j);
+            if (pane.min_size != wxDefaultSize)
+            {
+				int paneSize = dock.IsHorizontal() ? pane.min_size.y : pane.min_size.x;
+                if (pane.HasBorder())
+					paneSize += 2 * pane_borderSize;
+                if (pane.HasCaption() && dock.IsHorizontal())
+					paneSize += caption_size;
+
+				if (paneSize > dock_min_size)
+					dock_min_size = paneSize;
+            }
+        }
+
+        dock.min_size = dock_min_size;

__________________________________________________________________________________________________________
/src/gtk/menu.cpp

-g_signal_connect(m_menu, "map", G_CALLBACK(menu_map), this);
+g_signal_connect(m_menu, "show", G_CALLBACK(menu_map), this); //"map" is never called on Ubuntu Unity, but "show" is

__________________________________________________________________________________________________________
/src/gtk/window.cpp
Backspace not working in filter dialog: http://www.freefilesync.org/forum/viewtopic.php?t=347

 void wxWindowGTK::ConnectWidget( GtkWidget *widget )
 {
-     static bool isSourceAttached;
-    if (!isSourceAttached)
-    {
-        // attach GSource to detect new GDK events
-        isSourceAttached = true;
-        static GSourceFuncs funcs =
-        {
-            source_prepare, source_check, source_dispatch,
-            NULL, NULL, NULL
-        };
-        GSource* source = g_source_new(&funcs, sizeof(GSource));
-        // priority slightly higher than GDK_PRIORITY_EVENTS
-        g_source_set_priority(source, GDK_PRIORITY_EVENTS - 1);
-        g_source_attach(source, NULL);
-        g_source_unref(source);
-    }
 
     g_signal_connect (widget, "key_press_event",
                       G_CALLBACK (gtk_window_key_press_callback), this);

__________________________________________________________________________________________________________