--- a/Makefile.in	2021-12-27 09:42:14.575136019 +0100
+++ b/Makefile.in	2021-12-27 09:42:31.159870381 +0100
@@ -113,10 +113,6 @@
 endif
 
 install-clean:
-ifneq (,$(wildcard $(prefix)/lib/gnat/manifests/gtkada))
-	-$(GPRINSTALL) --uninstall -f --prefix=$(prefix) \
-		--project-subdir=lib/gnat gtkada
-endif
 
 install: install-clean
 	${GPRINSTALL_FULL} -XLIBRARY_TYPE=$(LIBRARY_TYPE_FOR_TOOLS) \