--- a/tests/Makefile	Sun Jun 18 16:30:48 2023 +0200
+++ b/tests/Makefile	Tue Jun 20 15:05:21 2023 +0200
@@ -93,13 +93,13 @@
 endef
 $(foreach project,$(BUILT_PROJECTS),$(eval $(call make_src_rule,$(project))))
 
-$(build_dir)/matiec/iec2c: $(build_dir)/matiec/$(matiec_checksum).sha1
+$(build_dir)/matiec/iec2c: | $(build_dir)/matiec/$(matiec_checksum).sha1
 	cd $(build_dir)/matiec && \
     autoreconf -i && \
     ./configure && \
     make
 
-$(build_dir)/open62541/build/bin/libopen62541.a: $(build_dir)/open62541/$(open62541_checksum).sha1
+$(build_dir)/open62541/build/bin/libopen62541.a: | $(build_dir)/open62541/$(open62541_checksum).sha1
 	cd $(build_dir)/open62541 && \
     rm -rf build && mkdir build && cd build && \
 	cmake -D UA_ENABLE_ENCRYPTION=OPENSSL .. && \