diff --git a/.github/workflows/ci-config.yml b/.github/workflows/ci-config.yml
index 37bd732..2a1dbe9 100644
--- a/.github/workflows/ci-config.yml
+++ b/.github/workflows/ci-config.yml
@@ -24,7 +24,11 @@ jobs:
     - uses: actions/checkout@v4.1.1
 
     - name: Configure CMake
-      run: cmake -B ${{github.workspace}}/build -GNinja
+      run: cmake -B ${{github.workspace}}/build -GNinja -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} 2>&1 | tee ${{github.workspace}}/cmake.log
+
+    - name: Check versions
+      if: github.event.pull_request.base.ref == 'main'
+      run: (! grep -e "Using .* with unreleased version" ${{github.workspace}}/cmake.log)
 
     - name: Cache build directory
       if: always()
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 53d0913..37d88d7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,16 +19,15 @@
 # You should have received a copy of the GNU General Public License
 # along with ECAP5-DTESTLIB.  If not, see <http://www.gnu.org/licenses/>.
 
-cmake_minimum_required(VERSION 3.12)
+cmake_minimum_required(VERSION 3.21)
 include(FetchContent)
 
-project(ECAP5_DTESTLIB VERSION 1.0.0)
+project(ECAP5_DTESTLIB)
 
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
 set(CMAKE_PREFIX_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
 
 # Create python virtual env
-message(STATUS "Creating python venv")
 set(VENV_DIR ${CMAKE_BINARY_DIR}/venv)
 if(NOT EXISTS "${VENV_DIR}")
   find_package(Python3 COMPONENTS Interpreter)
@@ -41,32 +40,44 @@ find_package(Python3 COMPONENTS Interpreter Development)
 
 # Dependencies
 
-message(STATUS "Collecting dependencies")
 include(${CMAKE_CURRENT_LIST_DIR}/cmake/dependency.cmake)
 
-add_dependency(ECAP5_TREQ 
-  GIT ecap5/ecap5-treq
-  TAG tags/v2.2.0
-  BINARY ecap5-treq)
-
-add_dependency(sphinx-cmake
+add_dependency(
   GIT ecap5/sphinx-cmake
   TAG tags/v1.0.1)
 
-add_dependency(verilator-cmake
+add_dependency(
   GIT ecap5/verilator-cmake
   TAG tags/v1.0.1)
 
-# Configure dependencies
+add_dependency(
+  GIT ecap5/ecap5-treq
+  TAG 109-use-cmake-interface-libraries
+  BINARY ecap5-treq)
+
+# Define an interface library
 
-include(${verilator_cmake_SOURCE_DIR}/cmake/verilator-config.cmake)
-include(${ecap5_treq_SOURCE_DIR}/config.cmake)
-list(APPEND CMAKE_MODULE_PATH "${sphinx_cmake_SOURCE_DIR}/cmake")
-include(${CMAKE_CURRENT_LIST_DIR}/cmake/lint.cmake)
-include(${CMAKE_CURRENT_LIST_DIR}/cmake/testbench.cmake)
+add_library(ecap5_dtestlib INTERFACE)
+target_sources(ecap5_dtestlib INTERFACE
+  ${CMAKE_CURRENT_LIST_DIR}/src/instr_wb_slave.sv
+)
 
-# Include subdirectories
+# Only perform if the project will be tested
 
-add_subdirectory(docs)
-add_subdirectory(tests)
+if(PROJECT_IS_TOP_LEVEL)
+  # Configure dependencies
 
+  list(APPEND CMAKE_MODULE_PATH "${ecap5_sphinx_cmake_SOURCE_DIR}/cmake")
+  include(${ecap5_verilator_cmake_SOURCE_DIR}/cmake/verilator-config.cmake)
+  include(${ecap5_ecap5_treq_SOURCE_DIR}/config.cmake)
+
+  # Include local cmake configuration files
+
+  include(${CMAKE_CURRENT_LIST_DIR}/cmake/lint.cmake)
+  include(${CMAKE_CURRENT_LIST_DIR}/cmake/testbench.cmake)
+
+  # Include subdirectories
+
+  add_subdirectory(docs)
+  add_subdirectory(tests)
+endif()
diff --git a/cmake/dependency.cmake b/cmake/dependency.cmake
index c82ee15..60e913a 100644
--- a/cmake/dependency.cmake
+++ b/cmake/dependency.cmake
@@ -1,26 +1,57 @@
-macro(add_dependency id)
+macro(add_dependency)
   cmake_parse_arguments(ARG ""
                             "GIT;TAG;BINARY"
                             ""
                             ${ARGN})
-  string(MAKE_C_IDENTIFIER "${id}" name)
-  string(TOLOWER "${name}" name)
-
-  FetchContent_Declare(${name}
-    GIT_REPOSITORY https://github.com/${ARG_GIT}
-    GIT_TAG ${ARG_TAG}
-    SOURCE_SUBDIR __none__
-  )
-  FetchContent_MakeAvailable(${name})
-
-  if(NOT DEFINED ${name}_EXECUTABLE)
-    if(EXISTS "${${name}_SOURCE_DIR}/pyproject.toml")
-      message(STATUS "Configuring ${name}")
-      execute_process(COMMAND ${Python3_EXECUTABLE} -m pip install -e ${${name}_SOURCE_DIR} OUTPUT_QUIET RESULT_VARIABLE rv)
-      if("${rv}" STREQUAL "0")
-        set(${name}_EXECUTABLE ${VENV_DIR}/bin/${ARG_BINARY} CACHE STRING "path to the ${name} executable")
+  set(REPOSITORY_URL https://github.com/${ARG_GIT})
+
+  # Create a unique identifier for the dependency
+  string(MAKE_C_IDENTIFIER "${ARG_GIT}" DEPENDENCY_ID)
+  string(TOLOWER "${DEPENDENCY_ID}" DEPENDENCY_ID)
+
+  get_property(IS_DEPENDENCY_PRESENT GLOBAL PROPERTY ${DEPENDENCY_ID}_VERSION SET)
+
+  # Check if the dependency is already present
+  if(${IS_DEPENDENCY_PRESENT})
+    get_property(${DEPENDENCY_ID}_VERSION GLOBAL PROPERTY ${DEPENDENCY_ID}_VERSION)
+    # Check that the version is the same
+    if(NOT ${DEPENDENCY_ID}_VERSION STREQUAL ARG_TAG)
+      message(FATAL_ERROR "Dependency ${ARG_GIT} version mismatched\n\t${${DEPENDENCY_ID}_VERSION} != ${ARG_TAG}")
+    endif()
+  else()
+    message(STATUS "Configuring ${ARG_GIT}")
+
+    # Define the version
+    set_property(GLOBAL PROPERTY ${DEPENDENCY_ID}_VERSION ${ARG_TAG})
+
+    # Check if released version
+    if(CMAKE_BUILD_TYPE STREQUAL "Release")
+      if(NOT ${ARG_TAG} MATCHES "^tags/.*")
+        message(WARNING "Using ${ARG_GIT} with unreleased version ${ARG_TAG}")
       endif()
     endif()
-  endif()
 
+    # Fetch the repository
+    FetchContent_Declare(${DEPENDENCY_ID}
+      GIT_REPOSITORY ${REPOSITORY_URL}
+      GIT_TAG ${ARG_TAG}
+      SOURCE_SUBDIR __none__
+    )
+    FetchContent_MakeAvailable(${DEPENDENCY_ID})
+
+    # Add cmake build if it exists
+    if(EXISTS "${${DEPENDENCY_ID}_SOURCE_DIR}/CMakeLists.txt")
+      add_subdirectory(${${DEPENDENCY_ID}_SOURCE_DIR} ${${DEPENDENCY_ID}_SOURCE_DIR}/../${DEPENDENCY_ID}-build)
+    endif()
+
+    # Handle python executable if it exists
+    if(NOT DEFINED ${DEPENDENCY_ID}_EXECUTABLE)
+      if(EXISTS "${${DEPENDENCY_ID}_SOURCE_DIR}/pyproject.toml")
+        execute_process(COMMAND ${Python3_EXECUTABLE} -m pip install -e ${${DEPENDENCY_ID}_SOURCE_DIR} OUTPUT_QUIET RESULT_VARIABLE rv)
+        if("${rv}" STREQUAL "0")
+          set(${DEPENDENCY_ID}_EXECUTABLE ${VENV_DIR}/bin/${ARG_BINARY} CACHE STRING "path to the ${DEPENDENCY_ID} executable")
+        endif()
+      endif()
+    endif()
+  endif()
 endmacro()
diff --git a/cmake/lint.cmake b/cmake/lint.cmake
index d7436d5..91e0e24 100644
--- a/cmake/lint.cmake
+++ b/cmake/lint.cmake
@@ -24,15 +24,19 @@ set(DEFAULT_WAIVE_FILE ${CMAKE_CURRENT_LIST_DIR}/../config/default-verible-lint.
 
 function(add_lint_target)
   cmake_parse_arguments(ARG ""
-                            "TARGET;CUSTOM_RULE_FILE;CUSTOM_WAIVE_FILE"
-                            "SRC_DIRS"
+                            "LIB;TARGET;CUSTOM_RULE_FILE;CUSTOM_WAIVE_FILE"
+                            ""
                             ${ARGN})
   if (NOT ARG_TARGET)
     message(FATAL_ERROR "Need a target name")
   endif()
 
-  if (NOT ARG_SRC_DIRS)
-    message(FATAL_ERROR "Need a source directory")
+  if (NOT ARG_LIB)
+    message(FATAL_ERROR "Need an interface library")
+  endif()
+
+  if (NOT TARGET ${ARG_LIB})
+    message(FATAL_ERROR "Library ${ARG_LIB} not defined")
   endif()
 
   if (NOT CUSTOM_RULE_FILE)
@@ -43,9 +47,9 @@ function(add_lint_target)
     set(CUSTOM_WAIVE_FILE ${DEFAULT_WAIVE_FILE})
   endif()
 
-  file(GLOB SRC_FILES ${ARG_SRC_DIRS}/*.sv)
   add_custom_target(${ARG_TARGET}
-    COMMAND verible-verilog-lint ${SRC_FILES} --rules_config="${CUSTOM_RULE_FILE}" --waiver_files="${CUSTOM_WAIVE_FILE}"
-    DEPENDS ${SRC_FILES} ${CUSTOM_RULE_FILE} ${CUSTOM_WAIVE_FILE})
+    COMMAND verible-verilog-lint $<TARGET_PROPERTY:${ARG_LIB},INTERFACE_SOURCES> --rules_config="${CUSTOM_RULE_FILE}" --waiver_files="${CUSTOM_WAIVE_FILE}"
+    DEPENDS ${SRC_FILES} ${CUSTOM_RULE_FILE} ${CUSTOM_WAIVE_FILE}
+    COMMAND_EXPAND_LISTS)
 endfunction()
 
diff --git a/cmake/testbench.cmake b/cmake/testbench.cmake
index 22e628e..715df29 100644
--- a/cmake/testbench.cmake
+++ b/cmake/testbench.cmake
@@ -19,10 +19,38 @@
 # You should have received a copy of the GNU General Public License
 # along with ECAP5-DTESTLIB.  If not, see <http://www.gnu.org/licenses/>.
 
+function(get_all_sources_recursive TARGET_NAME OUTPUT_LIST)
+  set(CURRENT_FILES "")
+
+  get_target_property(RAW_SOURCES ${TARGET_NAME} INTERFACE_SOURCES)
+
+  if(RAW_SOURCES AND NOT "${RAW_SOURCES}" MATCHES "NOTFOUND")
+    list(APPEND CURRENT_FILES ${RAW_SOURCES})
+  endif()
+
+  get_target_property(RAW_LIBS ${TARGET_NAME} INTERFACE_LINK_LIBRARIES)
+  if(RAW_LIBS AND NOT "${RAW_LIBS}" MATCHES "NOTFOUND")
+    foreach(DEP ${RAW_LIBS})
+      if(TARGET ${DEP})
+        get_all_sources_recursive(${DEP} SUB_FILES_LIST)
+        list(APPEND CURRENT_FILES ${SUB_FILES_LIST})
+      else()
+        message(FATAL_ERROR "Recursive dependency ${DEP} not found")  
+      endif()
+    endforeach()
+  endif()
+
+  if(CURRENT_FILES)
+    list(REMOVE_DUPLICATES CURRENT_FILES)
+  endif()
+
+  set(${OUTPUT_LIST} ${CURRENT_FILES} PARENT_SCOPE)
+endfunction()
+
 macro(add_testbench)
   cmake_parse_arguments(ARG ""
-                            "MODULE;BENCH_DIR;LIBS_DIR;BENCH;TESTDATA_DIR"
-                            "SRC_DIRS;INCLUDE_DIRS;LIBS;CUSTOM_DEPENDS"
+                            "MODULE;BENCH_DIR;BENCH;TESTDATA_DIR"
+                            "LIBS;CUSTOM_DEPENDS;TEST_INCLUDE_DIRS"
                             ${ARGN})
   if(NOT ARG_BENCH_DIR)
     message(FATAL_ERROR "Need a bench directory")
@@ -36,10 +64,16 @@ macro(add_testbench)
     message(FATAL_ERROR "Need a testdata directory")
   endif()
 
-  if(NOT ARG_SRC_DIRS)
-    message(FATAL_ERROR "Need at least one source directory")
+  if(NOT ARG_LIBS)
+    message(FATAL_ERROR "Need at least one source library")
   endif()
 
+  foreach(LIB ${ARG_LIBS})
+    if(NOT TARGET ${LIB})
+      message(FATAL_ERROR "Library ${LIB} not defined")
+    endif()
+  endforeach()
+
   # Create folders for the waves and testdata
   file(MAKE_DIRECTORY ${TESTDATA_DIR}/waves)
   file(MAKE_DIRECTORY ${TESTDATA_DIR}/testdata)
@@ -49,22 +83,20 @@ macro(add_testbench)
   endif()
   set(TARGET tb_${ARG_BENCH})
 
-  # Make a file list for testing libraries
-  list(TRANSFORM ARG_LIBS APPEND ".sv")
-  list(TRANSFORM ARG_LIBS PREPEND ${ARG_LIBS_DIR})
+  # Define a source collecting library
+  add_library(lib${TARGET} INTERFACE)
+  target_link_libraries(lib${TARGET} INTERFACE ${ARG_LIBS})
 
-  # List include files
-  file(GLOB INCLUDE_FILES ${ARG_INCLUDE_DIRS}/*.svh)
+  get_all_sources_recursive(lib${TARGET} ${TARGET}_SOURCES)
 
   # Create the test executable
   add_executable(${TARGET} ${ARG_BENCH_DIR}/${ARG_MODULE}/${TARGET}.cpp)
-  target_include_directories(${TARGET} PUBLIC ${TEST_INCLUDE_DIR})
+  target_include_directories(${TARGET} PUBLIC ${ARG_TEST_INCLUDE_DIRS})
   verilate(${TARGET}
-    PREFIX V${TARGET}
-    SOURCES ${INCLUDE_FILES}
-            ${ARG_BENCH_DIR}/${ARG_MODULE}/${TARGET}.sv
-            ${ARG_LIBS}
-    INCLUDE_DIRS ${ARG_SRC_DIRS}
+    PREFIX     V${TARGET}
+    TOP_MODULE ${TARGET}
+    SOURCES    ${${TARGET}_SOURCES}
+               ${ARG_BENCH_DIR}/${ARG_MODULE}/${TARGET}.sv
     TRACE)
 
   set(TEST_TARGET simulate_${ARG_BENCH})
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 45895dd..ab451a1 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -22,27 +22,23 @@
 # Bench parent directory
 set(BENCH_DIR ${CMAKE_CURRENT_SOURCE_DIR}/benches/)
 # C++ bench include directory
-set(TEST_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/include/)
-# HDL source directories
-set(SRC_DIRS ${CMAKE_SOURCE_DIR}/src/)
-# HDL library directories
-set(LIBS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/libs/)
+set(TEST_INCLUDE_DIRS ${CMAKE_SOURCE_DIR}/include/)
 # Bench CSV output directory
-set(TESTDATA_DIR ${CMAKE_CURRENT_BINARY_DIR}/testdata/)
+set(TESTDATA_DIR ${CMAKE_CURRENT_BINARY_DIR}/)
 
 # Lint
 add_lint_target(
   TARGET lint
-  SRC_DIRS ${SRC_DIRS}
+  LIB    ecap5_dtestlib
 )
 
 # Add testbenches
 add_testbench(
-  MODULE       instr_wb_slave
-  BENCH_DIR    ${BENCH_DIR}
-  LIBS_DIR     ${LIBS_DIR}
-  TESTDATA_DIR ${TESTDATA_DIR}
-  SRC_DIRS     ${SRC_DIRS} 
+  MODULE            instr_wb_slave
+  LIBS              ecap5_dtestlib
+  BENCH_DIR         ${BENCH_DIR}
+  TESTDATA_DIR      ${TESTDATA_DIR}
+  TEST_INCLUDE_DIRS ${TEST_INCLUDE_DIRS}
 )
 
 # Main targets