diff --git a/Makefile b/Makefile
index 70cc850..ff5b96b 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ export CXXFLAGS
 export AR
 
 
-all: src tests
+all: src
 
 
 src: FORCE
@@ -13,9 +13,15 @@ src: FORCE
 
 
 tests: FORCE
+	$(MAKE) -C src
 	$(MAKE) -C tests
 
 
+tests-gcc10: FORCE
+	env CXX=g++10 CXXFLAGS="-Wl,-rpath=/usr/local/lib/gcc10/ -Wall -pedantic -O0 -g3 -std=c++20 -I../src -I/usr/local/include" $(MAKE) -C src
+	env CXX=g++10 CXXFLAGS="-Wl,-rpath=/usr/local/lib/gcc10/ -Wall -pedantic -O0 -g3 -std=c++20 -I../src -I/usr/local/include" $(MAKE) -C tests
+
+
 clean: FORCE
 	$(MAKE) -C src clean
 	$(MAKE) -C tests clean
@@ -26,5 +32,7 @@ depend: FORCE
 	$(MAKE) -C tests depend
 
 
+
+
 FORCE:
 
diff --git a/tests/Makefile b/tests/Makefile
index bd4e83f..6d6de49 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -11,27 +11,23 @@ CXXFLAGS = -Wall -pedantic -O2 -std=c++20 -I../src -I/usr/local/include
 endif
 
 
-
 progname = tests
+pikotoolslibfile = ../src/pikotools.a
 
 
-all: $(progname) pikotools
+all: $(progname)
 
 
-$(progname): $(objfiles) pikotools
-	$(CXX) $(CXXFLAGS) -o $(progname) $(objfiles) ../src/pikotools.a
+$(progname): $(objfiles) FORCE
+	$(CXX) $(CXXFLAGS) -o $(progname) $(objfiles) $(pikotoolslibfile)
 
 
 %.o: %.cpp
 	$(CXX) -c $(CXXFLAGS) -o $@ $<
 
 
-pikotools: FORCE
-	$(MAKE) -C ../src
 
 
-FORCE:
-
 
 clean:
 	rm -f $(objfiles)
@@ -42,5 +38,8 @@ depend:
 	makedepend -Y. -I../src -f- $(sourcefiles) > Makefile.dep
 
 
+FORCE:
+
+
 -include Makefile.dep