We need to change gtk-update-icon-cache to gtk4-update-icon-cache, as that tool
has been renamed.
dist_appsicon48_DATA = data/48x48/gtk4-demo.png data/48x48/gtk4-demo-symbolic.symbolic.png
dist_appsicon256_DATA = data/256x256/gtk4-demo.png data/256x256/gtk4-demo-symbolic.symbolic.png
-update_icon_cache = $(top_builddir)/gtk/gtk-update-icon-cache$(EXEEXT) --ignore-theme-index --force
+update_icon_cache = $(top_builddir)/gtk/gtk4-update-icon-cache$(EXEEXT) --ignore-theme-index --force
install-data-hook: install-update-icon-cache
uninstall-hook: uninstall-update-icon-cache
dist_appsicon48_DATA = data/48x48/gtk4-widget-factory.png data/48x48/gtk4-widget-factory-symbolic.symbolic.png
dist_appsicon256_DATA = data/256x256/gtk4-widget-factory.png data/256x256/gtk4-widget-factory-symbolic.symbolic.png
-update_icon_cache = $(top_builddir)/gtk/gtk-update-icon-cache$(EXEEXT) --ignore-theme-index --force
+update_icon_cache = $(top_builddir)/gtk/gtk4-update-icon-cache$(EXEEXT) --ignore-theme-index --force
install-data-hook: install-update-icon-cache
uninstall-hook: uninstall-update-icon-cache