diff --git a/make.sh b/make.sh
index f257882..c84f7c9 100755
--- a/make.sh
+++ b/make.sh
@@ -120,9 +120,9 @@ fi
 
 cd src
 cp Makefile.in Makefile
-perl -pi -e "s#\\\$\(CFLAGS\)#$CFLAGS#g" Makefile
-perl -pi -e "s#\\\$\(LIBS\)#$LIBS#g" Makefile
-perl -pi -e "s#\\\$\(LIB_VERSION\)#$LIB_VERSION#g" Makefile
+sed -i "s/\\\$(CFLAGS)/$CFLAGS/g" Makefile
+sed -i "s/\\\$(LIBS)/$LIBS/g" Makefile
+sed -i "s/\\\$(LIB_VERSION)/$LIB_VERSION/g" Makefile
 make $1 $2 $3
 
 if [ "$1" = "clean" ]; then
diff --git a/src/Makefile.in b/src/Makefile.in
index b41c770..fa213f8 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -3,7 +3,6 @@
 COMPILE = $(CC) $(CFLAGS)
 INC_PATH = 
 LIB_PATH = $(LIBS)
-LIB_VERSION = $(LIB_VERSION)
 
 FAST_SHARED_OBJS = hash.lo chain.lo shared_func.lo ini_file_reader.lo \
                    logger.lo sockopt.lo base64.lo sched_thread.lo \
diff --git a/src/tests/test_skiplist.c b/src/tests/test_skiplist.c
index 2f6b7db..cc65491 100644
--- a/src/tests/test_skiplist.c
+++ b/src/tests/test_skiplist.c
@@ -61,6 +61,20 @@ static int test_insert()
     return 0;
 }
 
+static void test_delete()
+{
+    int i;
+    int64_t start_time;
+    int64_t end_time;
+
+    start_time = get_current_time_ms();
+    for (i=1; i<=COUNT; i++) {
+        assert(skiplist_delete(&sl, &i) == 0);
+    }
+    end_time = get_current_time_ms();
+    printf("delete time used: %"PRId64" ms\n", end_time - start_time);
+}
+
 int main(int argc, char *argv[])
 {
     int i;
@@ -97,12 +111,7 @@ int main(int argc, char *argv[])
 
     test_insert();
 
-    start_time = get_current_time_ms();
-    for (i=1; i<=COUNT; i++) {
-        assert(skiplist_delete(&sl, &i) == 0);
-    }
-    end_time = get_current_time_ms();
-    printf("delete time used: %"PRId64" ms\n", end_time - start_time);
+    test_delete();
 
     start_time = get_current_time_ms();
     for (i=1; i<=COUNT; i++) {
@@ -121,6 +130,7 @@ int main(int argc, char *argv[])
 
     test_insert();
 
+    test_delete();
     skiplist_destroy(&sl);
 
     printf("pass OK\n");