diff --color -Naur vte-0.66.0.orig/meson.build vte-0.66.0/meson.build
--- vte-0.66.0.orig/meson.build	2021-10-26 15:49:40.539203281 +0800
+++ vte-0.66.0/meson.build	2021-10-26 15:51:22.749208116 +0800
@@ -30,9 +30,9 @@
 # Compiler requirements
 
 c_req_std                 = 'gnu11'
-cxx_req_std               = 'gnu++20'
-gxx_req_version           = '10.0'
-clangxx_req_version       = '11.0'
+cxx_req_std               = 'gnu++17'
+gxx_req_version           = '7.0'
+clangxx_req_version       = '8.0'
 
 # Version requirements
 
diff --color -Naur vte-0.66.0.orig/src/widget.cc vte-0.66.0/src/widget.cc
--- vte-0.66.0.orig/src/widget.cc	2021-10-26 15:49:40.548203282 +0800
+++ vte-0.66.0/src/widget.cc	2021-10-27 04:08:33.405300452 +0800
@@ -402,7 +402,11 @@
 #endif /* VTE_GTK == 4 */
 
 Widget::Widget(VteTerminal* t)
-        : m_widget{&t->widget}
+        : m_widget{&t->widget},
+          m_hscroll_policy(GTK_SCROLL_NATURAL),
+          m_vscroll_policy(GTK_SCROLL_NATURAL),
+          m_scroll_unit_is_pixels(false),
+          m_changing_scroll_position(false)
 {
         // Create a default adjustment
         set_vadjustment({});
diff --color -Naur vte-0.66.0.orig/src/widget.hh vte-0.66.0/src/widget.hh
--- vte-0.66.0.orig/src/widget.hh	2021-10-26 15:49:40.548203282 +0800
+++ vte-0.66.0/src/widget.hh	2021-10-27 04:08:52.888301374 +0800
@@ -577,10 +577,10 @@
         vte::glib::RefPtr<GtkAdjustment> m_vadjustment{};
         vte::glib::RefPtr<GtkAdjustment> m_hadjustment{};
 
-        unsigned m_hscroll_policy:1{GTK_SCROLL_NATURAL};
-        unsigned m_vscroll_policy:1{GTK_SCROLL_NATURAL};
-        unsigned m_scroll_unit_is_pixels:1{false};
-        unsigned m_changing_scroll_position:1{false};
+        unsigned m_hscroll_policy:1;
+        unsigned m_vscroll_policy:1;
+        unsigned m_scroll_unit_is_pixels:1;
+        unsigned m_changing_scroll_position:1;
 };
 
 } // namespace platform