Adding support for building in both postmarketos and flatpak.

Neat trick with dlsym employed.

meson.build

@@ -29,9 +29,14 @@ sources = [
     'src/main.c',
 ]
 
+link_arguments = [
+    '-ldl'
+]
+                        
 executable('openmg',
     sources,
     dependencies : openmgdeps,
     include_directories : inc,
-    install : true
+    install : true,
+    link_args : link_arguments
 )

src/view/main_view.c

@@ -1,3 +1,5 @@
+#include <dlfcn.h>
+
 #include <gtk/gtk.h>
 #include <adwaita.h>
 
@@ -26,7 +28,14 @@ activate (AdwApplication *app,
     GtkListView *list_view;
     GtkWidget *scroll;
     AdwLeaflet *views_leaflet = ADW_LEAFLET (adw_leaflet_new ());
-    adw_leaflet_set_can_swipe_back (views_leaflet, 1);
+    typedef void (*swipe_back_t)(AdwLeaflet *, gboolean);
+    swipe_back_t swipe_back = (swipe_back_t) dlsym
+        (NULL, "adw_leaflet_set_can_navigate_back");
+    if (!swipe_back) {
+        swipe_back = (swipe_back_t) dlsym
+        (NULL, "adw_leaflet_set_can_swipe_back");
+    }
+    swipe_back (views_leaflet, 1);
 
     create_headerbar (box, views_leaflet);