diff --git a/CUDA.make b/CUDA.make
index 9a7ec88..ef193df 100644
--- a/CUDA.make
+++ b/CUDA.make
@@ -2,3 +2,7 @@
 cuda-stream: main.cpp CUDAStream.cu
 	nvcc -std=c++11 -O3 -DCUDA $^ $(EXTRA_FLAGS) -o $@
 
+.PHONY: clean
+clean:
+	rm -f cuda-stream
+
diff --git a/HIP.make b/HIP.make
index 25460fe..bbd142e 100644
--- a/HIP.make
+++ b/HIP.make
@@ -11,3 +11,8 @@ endif
 
 hip-stream: main.cpp HIPStream.cu
 	$(HIPCC) $(CXXFLAGS) -std=c++11 -DHIP $^ $(EXTRA_FLAGS) -o $@
+
+.PHONY: clean
+clean:
+	rm -f hip-stream
+
diff --git a/OpenACC.make b/OpenACC.make
index 2799603..d9fbc36 100644
--- a/OpenACC.make
+++ b/OpenACC.make
@@ -28,3 +28,7 @@ CXXFLAGS = $(FLAGS_$(COMPILER))
 acc-stream: main.cpp ACCStream.cpp
 	$(CXX) $(CXXFLAGS) -DACC $^ $(EXTRA_FLAGS) -o $@
 
+.PHONY: clean
+clean:
+	rm -f acc-stream
+
diff --git a/OpenCL.make b/OpenCL.make
index 62c4f43..0075424 100644
--- a/OpenCL.make
+++ b/OpenCL.make
@@ -15,3 +15,7 @@ CXXFLAGS=$(FLAGS_$(COMPILER))
 ocl-stream: main.cpp OCLStream.cpp
 	$(COMPILER_$(COMPILER)) $(CXXFLAGS) -DOCL $^ $(EXTRA_FLAGS) -lOpenCL -o $@
 
+.PHONY: clean
+clean:
+	rm -f ocl-stream
+
diff --git a/OpenMP.make b/OpenMP.make
index 2fd47e7..0757f0d 100644
--- a/OpenMP.make
+++ b/OpenMP.make
@@ -37,3 +37,8 @@ omp-stream: main.cpp OMPStream.cpp
 omp-target-stream: main.cpp OMPStream.cpp
 	$(CXX) $(CXXFLAGS) -DOMP -DOMP_TARGET_GPU $^ $(OMP_TARGET) $(EXTRA_FLAGS) -o $@
 
+.PHONY: clean
+clean:
+	rm -f omp-stream
+	rm -f omp-target-stream
+
diff --git a/RAJA.make b/RAJA.make
index 3f456cb..bcfbba7 100644
--- a/RAJA.make
+++ b/RAJA.make
@@ -9,7 +9,7 @@ COMP=$(CXX)
 CXXFLAGS = -O3 -std=c++11 -DRAJA_TARGET_CPU
 
 ifndef COMPILER
-$(error No COMPILER defined. Specify COMPILER for correct OpenMP flag.)
+$(info No COMPILER defined. Specify COMPILER for correct OpenMP flag.)
 endif
 ifeq ($(COMPILER), INTEL)
 COMP = icpc
@@ -33,3 +33,8 @@ endif
 
 raja-stream: main.cpp RAJAStream.cpp
 	$(COMP) $(CXXFLAGS) -DUSE_RAJA -I$(RAJA_PATH)/include $^ $(EXTRA_FLAGS) -L$(RAJA_PATH)/lib -lRAJA -o $@
+
+.PHONY: clean
+clean:
+	rm -f raja-stream
+