diff --git a/cmake/cblas.cmake b/cmake/cblas.cmake
index 4e1ae7dc81231943c4bf3db4d4ac6f073f4fd1c4..26306f9849100d4463dde267acae5392cc81d7ac 100644
--- a/cmake/cblas.cmake
+++ b/cmake/cblas.cmake
@@ -16,7 +16,7 @@
 set(CBLAS_FOUND OFF)
 
 ## Find MKL First.
-set(MKL_ROOT $ENV{MKL_ROOT} CACHE PATH "Folder contains MKL")
+set(MKL_ROOT $ENV{MKLROOT} CACHE PATH "Folder contains MKL")
 
 find_path(MKL_INCLUDE_DIR mkl.h PATHS
   ${MKL_ROOT}/include)
diff --git a/cmake/external/protobuf.cmake b/cmake/external/protobuf.cmake
index c0cf2719f9a7b3ae6be5cefffa3dbd2c3f712e82..613614c0e3d42fac4147f78edbc1bd6d62847419 100644
--- a/cmake/external/protobuf.cmake
+++ b/cmake/external/protobuf.cmake
@@ -54,6 +54,7 @@ ExternalProject_Add(
   CONFIGURE_COMMAND
     ${CMAKE_COMMAND} ${PROTOBUF_SOURCES_DIR}/src/protobuf/cmake
     -Dprotobuf_BUILD_TESTS=OFF
+    -DZLIB_ROOT:FILEPATH=${ZLIB_ROOT}
     -DCMAKE_POSITION_INDEPENDENT_CODE=ON
     -DCMAKE_BUILD_TYPE=Release
     -DCMAKE_INSTALL_PREFIX=${PROTOBUF_INSTALL_DIR}