diff --git a/demos/python/python_glibc/install_python_with_conda.sh b/demos/python/python_glibc/install_python_with_conda.sh
index 9a5e8c75b..776049996 100755
--- a/demos/python/python_glibc/install_python_with_conda.sh
+++ b/demos/python/python_glibc/install_python_with_conda.sh
@@ -6,7 +6,7 @@ script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}"  )" >/dev/null 2>&1 && pwd )"
 [ -d occlum_instance ] || occlum new occlum_instance
 
 # 2. Install python and dependencies to specified position
-[ -d Miniconda3-latest-Linux-x86_64.sh ] || wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh
+[ -f Miniconda3-latest-Linux-x86_64.sh ] || wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh
 [ -d miniconda ] || bash ./Miniconda3-latest-Linux-x86_64.sh -b -p $script_dir/miniconda
 $script_dir/miniconda/bin/conda create --prefix $script_dir/python-occlum -y python=3.7 numpy=1.18.1 pandas=0.24.2 scipy=1.3.1 Cython scikit-learn=0.21.1
 
diff --git a/demos/python/python_glibc/run_python_on_occlum.sh b/demos/python/python_glibc/run_python_on_occlum.sh
index a59b02e6f..120292e01 100755
--- a/demos/python/python_glibc/run_python_on_occlum.sh
+++ b/demos/python/python_glibc/run_python_on_occlum.sh
@@ -16,8 +16,7 @@ if [ ! -d $python_dir ];then
 fi
 
 new_json="$(jq '.resource_limits.user_space_size = "640MB" |
-        .resource_limits.kernel_space_heap_size = "256MB" |
-        .process.default_mmap_size = "512MB" |
+        .resource_limits.kernel_space_heap_size = "300MB" |
         .env.default += ["PYTHONHOME=/opt/python-occlum"]' Occlum.json)" && \
 echo "${new_json}" > Occlum.json
 occlum build
diff --git a/src/sgxenv.mk b/src/sgxenv.mk
index 5988d20be..e76d219a5 100644
--- a/src/sgxenv.mk
+++ b/src/sgxenv.mk
@@ -133,7 +133,7 @@ SGX_CXXFLAGS_T := $(SGX_CFLAGS_T) -std=c++11 -nostdinc++ -I$(SGX_SDK)/include/li
 #  linked.
 SGX_LFLAGS_T = $(SGX_COMMON_CFLAGS) -nostdlib -L$(SGX_LIBRARY_PATH) $(_Other_Link_Flags) \
 	-Wl,--whole-archive -l$(Trts_Library_Name) -Wl,--no-whole-archive
-ifeq ($(TCMALLOC), Y)
+ifneq ($(TCMALLOC), N)
 SGX_LFLAGS_T += -Wl,--whole-archive -lsgx_tcmalloc -Wl,--no-whole-archive
 endif
 SGX_LFLAGS_T += -Wl,--start-group -lsgx_tcxx -lsgx_tstdc -l$(Crypto_Library_Name) -l$(Service_Library_Name) $(_Other_Enclave_Libs) -Wl,--end-group \