diff --git a/data/Makefile b/data/Makefile
index 4064eb9..726bcc9 100644
--- a/data/Makefile
+++ b/data/Makefile
@@ -14,6 +14,7 @@ libSystem.pc: libSystem.pc.in ../config.sh
 
 clean:
 	$(RM) -- $(libSystem.pc_OBJS)
+	./pkgconfig.sh -c -P "$(PREFIX)" -- "libSystem.pc"
 
 distclean: clean
 	$(RM) -- $(TARGETS)
diff --git a/doc/Makefile b/doc/Makefile
index 567663a..196eb49 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -28,10 +28,12 @@ gtkdoc/html.stamp: gtkdoc/libSystem-docs.xml gtkdoc/sgml.stamp gtkdoc/tmpl.stamp
 clean:
 	@for i in $(SUBDIRS); do (cd $$i && $(MAKE) clean) || exit; done
 	$(RM) -- $(gtkdoc/libSystem.types_OBJS) $(gtkdoc/tmpl.stamp_OBJS) $(gtkdoc/sgml.stamp_OBJS) $(gtkdoc/html.stamp_OBJS)
+	./gtkdoc.sh -c -P "$(PREFIX)" -- "gtkdoc/html.stamp"
 
 distclean:
 	@for i in $(SUBDIRS); do (cd $$i && $(MAKE) distclean) || exit; done
 	$(RM) -- $(gtkdoc/libSystem.types_OBJS) $(gtkdoc/tmpl.stamp_OBJS) $(gtkdoc/sgml.stamp_OBJS) $(gtkdoc/html.stamp_OBJS)
+	./gtkdoc.sh -c -P "$(PREFIX)" -- "gtkdoc/html.stamp"
 	$(RM) -- $(TARGETS)
 
 install: $(TARGETS)
diff --git a/tests/Makefile b/tests/Makefile
index 19f1d2e..5334c7c 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -43,6 +43,7 @@ variable.o: variable.c ../src/variable.c
 
 clean:
 	$(RM) -- $(string_OBJS) $(variable_OBJS) $(tests.log_OBJS)
+	./tests.sh -c -P "$(PREFIX)" -- "tests.log"
 
 distclean: clean
 	$(RM) -- $(TARGETS)