Try to fix startup crash in RHEL

src/netxs/desktopio/application.hpp

@@ -22,7 +22,7 @@ namespace netxs::app
 
 namespace netxs::app::shared
 {
-    static const auto version = "v2026.04.27";
+    static const auto version = "v2026.04.28";
     static const auto repository = "https://github.com/directvt/vtm";
     static const auto usr_config = "~/.config/vtm/settings.xml"s;
     static const auto sys_config = "/etc/vtm/settings.xml"s;

src/netxs/desktopio/baseui.hpp

@@ -1287,11 +1287,11 @@ namespace netxs::ui
             struct cleanup
             {
                 netxs::sptr<std::function<void()>> action;
-                cleanup(std::function<void()> f) 
+                cleanup(std::function<void()> f)
                     : action(ptr::shared(f))
                 { }
-                ~cleanup() 
-                { 
+                ~cleanup()
+                {
                     if (action && action.use_count() == 1)
                     {
                         (*action)();

src/netxs/desktopio/system.hpp

@@ -2200,7 +2200,9 @@ namespace netxs::os
                 #if defined(__BSD__) || defined(__ANDROID__)
                 auto uname = ::getlogin(); // username associated with a session, even if it has no controlling terminal.
                 #else
-                auto uname = ::cuserid(nullptr);
+                //auto uname = ::cuserid(nullptr); //todo ::cuserid() is incompatible with static linking (causes crash).
+                auto uname = std::getenv("USER");
+                if (!uname) uname = std::getenv("LOGNAME");
                 #endif
                 auto strid = utf::concat(usrid);
                 auto login = uname && uname[0] ? text{ uname } : strid;

src/netxs/desktopio/terminal.hpp

@@ -630,11 +630,13 @@ namespace netxs::ui
                 {
                     case 0:
                     default:
+                        //  4: Sixel graphics
                         // 61: VT Level 1 conformance
                         // 22: Color text
                         // 28: Rectangular area operations
                         // 52: Clipboard operations
                         // 10060: VT2D
+                        //todo queue.add("\x1b[?4;61;22;28;52;10060c");
                         queue.add("\x1b[?61;22;28;52;10060c");
                         break;
                 }