diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index ddd9b0e..c638980 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,3 +1,19 @@
+
+message ("GTEST_LIBRARIES: ${GTEST_LIBRARIES}")
+message ("GTest_LIBRARIES: ${GTest_LIBRARIES}")
+
+message ("GTEST_INCLUDE_DIRS: ${GTEST_INCLUDE_DIRS}")
+message ("GTest_INCLUDE_DIRS: ${GTest_INCLUDE_DIRS}")
+
+if (NOT GTEST_LIBRARIES)
+    set (GTEST_LIBRARIES ${GTest_LIBRARIES})
+endif()
+
+if (NOT GTEST_INCLUDE_DIRS)
+    set (GTEST_INCLUDE_DIRS ${GTest_INCLUDE_DIRS})
+endif()
+
+
 ####### unit_tests
 
 add_executable(unit_tests
@@ -13,12 +29,13 @@ add_dependencies(unit_tests
 
 target_include_directories(unit_tests
     PRIVATE
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}
-    $<BUILD_INTERFACE:${MYSQLPOOL_ROOT}/include
-    $<BUILD_INTERFACE:${MYSQLPOOL_ROOT}/src/lib
-    $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/generated-include>
-    $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/external-projects/installed/include>
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${MYSQLPOOL_ROOT}/include
+    ${MYSQLPOOL_ROOT}/src/lib
+    ${CMAKE_BINARY_DIR}/generated-include>
+    ${CMAKE_BINARY_DIR}/external-projects/installed/include>
+    ${CMAKE_CURRENT_BINARY_DIR}
+    ${GTEST_INCLUDE_DIRS}
     )
 
 target_link_libraries(unit_tests
@@ -33,8 +50,6 @@ target_link_libraries(unit_tests
 
 add_test(NAME unit_tests COMMAND unit_tests)
 
-message("GTEST_LIBRARIES: ${GTEST_LIBRARIES}")
-
 ####### integration_tests
 if (MYSQLPOOL_WITH_INTGRATION_TESTS)
 
@@ -51,12 +66,13 @@ add_dependencies(integration_tests
 
 target_include_directories(integration_tests
     PRIVATE
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}
-    $<BUILD_INTERFACE:${MYSQLPOOL_ROOT}/include
-    $<BUILD_INTERFACE:${MYSQLPOOL_ROOT}/src/lib
-    $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/generated-include>
-    $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/external-projects/installed/include>
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${MYSQLPOOL_ROOT}/include
+    ${MYSQLPOOL_ROOT}/src/lib
+    ${CMAKE_BINARY_DIR}/generated-include>
+    ${CMAKE_BINARY_DIR}/external-projects/installed/include>
+    ${CMAKE_CURRENT_BINARY_DIR}
+    ${GTEST_INCLUDE_DIRS}
     )
 
 target_link_libraries(integration_tests