--- a/testing/Makefile
+++ b/testing/Makefile
@@ -1,19 +1,19 @@
 all: randchars randprintable test_speed-kernel test_speed-userspace match_kernel
 
 randchars: randchars.c
-	gcc -O2 -o randchars randchars.c
+	$(CC) $(CFLAGS) -o randchars randchars.c
 
 randprintable: randprintable.c
-	gcc -O2 -o randprintable randprintable.c
+	$(CC) $(CFLAGS) -o randprintable randprintable.c
 
 test_speed-kernel: test_speed-kernel.c
-	gcc -o test_speed-kernel test_speed-kernel.c
+	$(CC) $(CFLAGS) -o test_speed-kernel test_speed-kernel.c
 
 test_speed-userspace: test_speed-userspace.cpp l7-parse-patterns.cpp l7-parse-patterns.h
-	g++ -Wall -o test_speed-userspace test_speed-userspace.cpp l7-parse-patterns.cpp
+	$(CXX) $(CXXFLAGS) -Wall -o test_speed-userspace test_speed-userspace.cpp l7-parse-patterns.cpp
 
 match_kernel: match-kernel.c
-	gcc -O2 -o match_kernel match-kernel.c
+	$(CC) $(CFLAGS) -o match_kernel match-kernel.c
 
 clean:
 	rm -f randprintable randchars test_speed-kernel test_speed-userspace match_kernel