diff --git a/trunk/research/gperftools/cpu-profiler/Makefile b/trunk/research/gperftools/cpu-profiler/Makefile
old mode 100644
new mode 100755
index a104b04b0..ea52b3126
--- a/trunk/research/gperftools/cpu-profiler/Makefile
+++ b/trunk/research/gperftools/cpu-profiler/Makefile
@@ -1,3 +1,7 @@
+.PHONY: default clean
+
+default: cpu_profiler
+
 cpu_profiler: cpu_profiler.cc Makefile
 	g++ -o cpu_profiler cpu_profiler.cc -g -O0 -ansi \
         -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free \
diff --git a/trunk/research/gperftools/heap-checker/Makefile b/trunk/research/gperftools/heap-checker/Makefile
index 4f3c86694..b0dfda71d 100644
--- a/trunk/research/gperftools/heap-checker/Makefile
+++ b/trunk/research/gperftools/heap-checker/Makefile
@@ -1,3 +1,7 @@
+.PHONY: default clean
+
+default: heap_checker
+
 heap_checker: heap_checker.cc Makefile
 	g++ -o heap_checker heap_checker.cc -g -O0 -ansi \
         -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free \
diff --git a/trunk/research/gperftools/heap-profiler/Makefile b/trunk/research/gperftools/heap-profiler/Makefile
index 39cc156c9..89a70f6e5 100644
--- a/trunk/research/gperftools/heap-profiler/Makefile
+++ b/trunk/research/gperftools/heap-profiler/Makefile
@@ -1,3 +1,7 @@
+.PHONY: default clean
+
+default: heap_checker
+
 heap_profiler: heap_profiler.cc Makefile
 	g++ -o heap_profiler heap_profiler.cc -g -O0 -ansi \
         -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free \