diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c795b05
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 03e1cc7..26ec718 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,61 +1,20 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
-
-CMAKE_POLICY(SET CMP0048 OLD)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.12...5.0)
 
 SET(PROJECT_NAME "LEMON")
-PROJECT(${PROJECT_NAME})
-
-INCLUDE(FindPythonInterp)
-INCLUDE(FindWget)
 
-IF(EXISTS ${PROJECT_SOURCE_DIR}/cmake/version.cmake)
-  INCLUDE(${PROJECT_SOURCE_DIR}/cmake/version.cmake)
-ELSEIF(DEFINED ENV{LEMON_VERSION})
+IF(DEFINED ENV{LEMON_VERSION})
   SET(LEMON_VERSION $ENV{LEMON_VERSION} CACHE STRING "LEMON version string.")
+ELSEIF(EXISTS ${CMAKE_SOURCE_DIR}/cmake/version.cmake)
+  INCLUDE(${CMAKE_SOURCE_DIR}/cmake/version.cmake)
 ELSE()
-  EXECUTE_PROCESS(
-    COMMAND
-    hg log -r. --template "{latesttag}"
-    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-    OUTPUT_VARIABLE HG_REVISION_TAG
-    ERROR_QUIET
-    OUTPUT_STRIP_TRAILING_WHITESPACE
-  )
-  EXECUTE_PROCESS(
-    COMMAND
-    hg log -r. --template "{latesttagdistance}"
-    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-    OUTPUT_VARIABLE HG_REVISION_DIST
-    ERROR_QUIET
-    OUTPUT_STRIP_TRAILING_WHITESPACE
-  )
-  EXECUTE_PROCESS(
-    COMMAND
-    hg log -r. --template "{node|short}"
-    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-    OUTPUT_VARIABLE HG_REVISION_ID
-    ERROR_QUIET
-    OUTPUT_STRIP_TRAILING_WHITESPACE
-  )
+  MESSAGE(FATAL_ERROR "LEMON_VERSION is not defined. Please set it in the environment")
+ENDIF()
 
-  IF(HG_REVISION_TAG STREQUAL "")
-    SET(HG_REVISION_ID "hg-tip")
-  ELSE()
-    IF(HG_REVISION_TAG STREQUAL "null")
-      SET(HG_REVISION_TAG "trunk")
-    ELSEIF(HG_REVISION_TAG MATCHES "^r")
-      STRING(SUBSTRING ${HG_REVISION_TAG} 1 -1 HG_REVISION_TAG)
-    ENDIF()
-    IF(HG_REVISION_DIST STREQUAL "0")
-      SET(HG_REVISION ${HG_REVISION_TAG})
-    ELSE()
-      SET(HG_REVISION
-	"${HG_REVISION_TAG}+${HG_REVISION_DIST}-${HG_REVISION_ID}")
-    ENDIF()
-  ENDIF()
 
-  SET(LEMON_VERSION ${HG_REVISION} CACHE STRING "LEMON version string.")
-ENDIF()
+PROJECT(${PROJECT_NAME} VERSION ${LEMON_VERSION})
+
+find_package(Python3 REQUIRED COMPONENTS Interpreter)
+INCLUDE(FindWget)
 
 SET(PROJECT_VERSION ${LEMON_VERSION})