diff --git a/examples_ptx/mandelbrot_tasks/Makefile b/examples_ptx/mandelbrot_tasks/Makefile
index bbbe44ff..7cb1ea53 100644
--- a/examples_ptx/mandelbrot_tasks/Makefile
+++ b/examples_ptx/mandelbrot_tasks/Makefile
@@ -2,15 +2,16 @@ PROG=mandelbrot_tasks
 ISPC_SRC=mandelbrot_tasks.ispc
 CXX_SRC=mandelbrot_tasks.cpp  mandelbrot_tasks_serial.cpp
 NVCC_SRC=../nvcc_helpers.cu
+NVCC_OBJS=objs/nvcc_helpers_nvcc.o
 
 CXX=g++
-CXXFLAGS=-O3 -I$(CUDATK)/include
+CXXFLAGS=-O3 -I$(CUDATK)/include -Iobjs/ -D_CUDA_
 
 NVCC=nvcc
-NVCC_FLAGS=-O3 -arch=sm_35
+NVCC_FLAGS=-O3 -arch=sm_35 -D_CUDA_
 
 LD=nvcc
-LDFLAGS=-lcudart -lcudadevrt
+LDFLAGS=-lcudart -lcudadevrt -arch=sm_35
 
 PTXCC=ptxcc
 PTXCC_FLAGS = -maxrregcount=32 -Xptxas=-v
@@ -22,18 +23,18 @@ ISPC_FLAGS=-O3 --math-lib=default --target=nvptx64 --opt=fast-math
 # PTXGEN += -opt=3
 # PTXGEN += -ftz=1 -prec-div=0 -prec-sqrt=0 -fma=1
 
-###.SUFFIXES: .bc .o .cu 
+ .SUFFIXES: .bc .o .cu 
 
 
-ISPC_OBJS=objs/$(ISPC_SRC:.ispc=_ispc.o)
-ISPC_BCS=objs/$(ISPC_SRC:.ispc=_ispc.bc)
-ISPC_HEADERS=objs/$(ISPC_SRC:.ispc=_ispc.h)
-CXX_OBJS=objs/$(CXX_SRC:.cpp=_gcc.o)
-NVCC_OBJS=objs/$(NVCC_SRC:.cu=_nvcc.o)
+ISPC_OBJS=$(ISPC_SRC:%.ispc=objs/%_ispc.o)
+ISPC_BCS=$(ISPC_SRC:%.ispc=objs/%_ispc.bc)
+ISPC_HEADERS=$(ISPC_SRC:%.ispc=objs/%_ispc.h)
+CXX_OBJS=$(CXX_SRC:%.cpp=objs/%_gcc.o)
+#NVCC_OBJS=$(NVCC_SRC:%.cu=objs/%_nvcc.o)
 
 OBJS=$(ISPC_OBJS) $(CXX_OBJS) $(NVCC_OBJS)
 
-all: $(PROG) $(ISPC_BCS) 
+all: dirs $(PROG) $(ISPC_BCS) 
 
 dirs:
 	/bin/mkdir -p objs/
@@ -41,22 +42,27 @@ dirs:
 objs/%.cpp objs/%.o objs/%.h: dirs
 
 clean: 
+	echo $(CXX_OBJS)
 	/bin/rm -rf $(PROG) objs
 
 $(PROG): $(OBJS)
 	$(LD) -o $@ $^ $(LDFLAGS)
 
-objs/%_gcc.o: %.cpp dirs $(ISPC_HEADERS)
+objs/%_gcc.o: %.cpp $(ISPC_HEADERS)
+	$(CXX) $(CXXFLAGS)  -o $@ -c $<
+objs/%_gcc.o: ../%.cpp 
 	$(CXX) $(CXXFLAGS)  -o $@ -c $<
 
-objs/%_cu.o: %.cu dirs
+objs/%_nvcc.o: ../%.cu
+	$(NVCC) $(NVCC_FLAGS) -o $@ -c $<
+objs/%_nvcc.o: %.cu 
 	$(NVCC) $(NVCC_FLAGS) -o $@ -c $<
 
-objs/%_ispc.h objs/%_ispc.bc: %.ispc dirs
+objs/%_ispc.h objs/%_ispc.bc: %.ispc 
 	$(ISPC) $(ISPC_FLAGS) --emit-llvm -h objs/$*_ispc.h -o objs/$*_ispc.bc $<
 
 objs/%_ispc.o: objs/%_ispc.bc 
-	$(PTXCC) $(PTXCC_FLAGS) $< -o $@
+	$(PTXCC) $< $(PTXCC_FLAGS) -o $@
 
 
 	 
diff --git a/examples_ptx/mandelbrot_tasks/mandelbrot_tasks.cpp b/examples_ptx/mandelbrot_tasks/mandelbrot_tasks.cpp
index 61678cdf..f40950c1 100644
--- a/examples_ptx/mandelbrot_tasks/mandelbrot_tasks.cpp
+++ b/examples_ptx/mandelbrot_tasks/mandelbrot_tasks.cpp
@@ -104,7 +104,7 @@ int main(int argc, char *argv[]) {
 
     int maxIterations = 512;
     int *buf;
-    ispc_malloc(&buf, n*widht*height);
+    ispc_malloc((void**)&buf, sizeof(int)*width*height);
 
     for (unsigned int i = 0; i < width * height; ++i)
       buf[i] = 0;
@@ -141,7 +141,7 @@ int main(int argc, char *argv[]) {
     {
       reset_and_start_timer();
       mandelbrot_serial(x0, y0, x1, y1, width, height, maxIterations, buf);
-      double dt = get_elapsed_mcycles();
+      double dt = get_elapsed_msec();
       printf("@time of serial run:\t\t\t[%.3f] msec\n", dt);
       minSerial = std::min(minSerial, dt);
     }
diff --git a/examples_ptx/timing.h b/examples_ptx/timing.h
index 7a44c531..1e2238b1 100644
--- a/examples_ptx/timing.h
+++ b/examples_ptx/timing.h
@@ -98,7 +98,7 @@ static inline void reset_and_start_timer()
 
 /* Returns the number of millions of elapsed processor cycles since the
    last reset_and_start_timer() call. */
-static inline double get_elapsed_mcycles()
+static inline double get_elapsed_msec()
 {
     end = rdtsc();
     tend = rtc();