diff --git a/cmake/external/lapack.cmake b/cmake/external/lapack.cmake
index e0f6b0304cc686ee1f25d9d3d9f9febf084f47bb..78c2659a58504e91a3d65f36b39c9a501bd9133f 100644
--- a/cmake/external/lapack.cmake
+++ b/cmake/external/lapack.cmake
@@ -91,9 +91,6 @@ find_file(
 if(LOCAL_LAPACK_LIB_ZIP)
   file(MD5 ${LAPACK_DOWNLOAD_DIR}/${LAPACK_FILE} LAPACK_MD5)
   if(NOT LAPACK_MD5 EQUAL LAPACK_URL_MD5)
-    # clean build file
-    file(REMOVE_RECURSE ${LAPACK_PREFIX_DIR})
-    file(REMOVE_RECURSE ${LAPACK_INSTALL_DIR})
     download_lapack()
   endif()
 else()
@@ -104,6 +101,7 @@ ExternalProject_Add(
   extern_lapack
   ${EXTERNAL_PROJECT_LOG_ARGS}
   URL ${LAPACK_DOWNLOAD_DIR}/${LAPACK_FILE}
+  URL_MD5 ${LAPACK_URL_MD5}
   DOWNLOAD_DIR ${LAPACK_DOWNLOAD_DIR}
   SOURCE_DIR ${LAPACK_LIB_DIR}
   PREFIX ${LAPACK_PREFIX_DIR}
diff --git a/cmake/external/libmct.cmake b/cmake/external/libmct.cmake
index 582d3216f486a9dd914c3f096a04710d98fa5fd1..15ee59642094a817fd4af51a9874b6ac24e0db91 100644
--- a/cmake/external/libmct.cmake
+++ b/cmake/external/libmct.cmake
@@ -43,10 +43,6 @@ set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_RPATH}" "${LIBMCT_ROOT}/lib")
 
 include_directories(${LIBMCT_INC_DIR})
 
-# clean build file
-file(REMOVE_RECURSE ${LIBMCT_PREFIX_DIR})
-file(REMOVE_RECURSE ${LIBMCT_INSTALL_DIR})
-
 file(
   DOWNLOAD ${LIBMCT_URL} ${LIBMCT_DOWNLOAD_DIR}/${LIBMCT_DOWNLOAD_FILE}
   TLS_VERIFY OFF
diff --git a/cmake/external/mklml.cmake b/cmake/external/mklml.cmake
index 426e5b53eb45f6e131190ad72c3c9c065fa8c994..801cab62facbb764029bd3b37d3e4d33c183f4ad 100644
--- a/cmake/external/mklml.cmake
+++ b/cmake/external/mklml.cmake
@@ -81,9 +81,6 @@ find_file(
 if(LOCAL_MKLML_LIB_ZIP)
   file(MD5 ${MKLML_DOWNLOAD_DIR}/${MKLML_FILE} MKLML_MD5)
   if(NOT MKLML_MD5 EQUAL MKLML_URL_MD5)
-    # clean build file
-    file(REMOVE_RECURSE ${MKLML_PREFIX_DIR})
-    file(REMOVE_RECURSE ${MKLML_INSTALL_DIR})
     download_mklml()
   endif()
 else()