diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2a75c5f..8f96e47 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,9 +1,9 @@
 # -*- mode: CMAKE; -*-
 
-cmake_minimum_required(VERSION 2.6)
-
 project(rpn)
 
+cmake_minimum_required(VERSION 3.22)
+
 if((NOT CMAKE_BUILD_TYPE MATCHES Debug)
     AND (NOT CMAKE_BUILD_TYPE MATCHES Release))
     set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build, options are: None Debug Release" FORCE)
@@ -11,12 +11,37 @@ endif()
 
 message(STATUS "Build mode: ${CMAKE_BUILD_TYPE}")
 
+if(EXISTS ${PROJECT_SOURCE_DIR}/.git)
+  EXECUTE_PROCESS(
+    COMMAND git rev-parse --abbrev-ref --short=10 HEAD
+    WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
+    OUTPUT_VARIABLE "BRANCH")
+    MESSAGE( STATUS "Source Git Branch: ${GIT_BRANCH}" )
+    EXECUTE_PROCESS(
+      COMMAND git describe --dirty --tags --long --always
+      WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
+      OUTPUT_VARIABLE "TAG"
+      ERROR_QUIET
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+      MESSAGE( STATUS "Source Git Tag: ${GIT_TAG}" )
+      EXECUTE_PROCESS(
+        COMMAND echo ${TAG}-${BRANCH}
+        WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}"
+        OUTPUT_VARIABLE "GIT_VERSION"
+        ERROR_QUIET
+        OUTPUT_STRIP_TRAILING_WHITESPACE)
+        MESSAGE( STATUS "Source Git version: ${GIT_VERSION}" )
+        add_definitions(-DGIT_VERSION="${GIT_VERSION}")
+  else(EXISTS ${PROJECT_SOURCE_DIR}/.git)
+    add_definitions(-DGIT_VERSION="unknown")
+    message("Warning, built outside of a git repo, version set to ${GIT_VERSION}")
+endif(EXISTS ${PROJECT_SOURCE_DIR}/.git)
+
 # INFO
-set(RPN_VERSION "2.4")
 set(RPN_DISPLAY_NAME "rpn")
 set(RPN_URL_INFO_ABOUT "https://github.com/louisrubet/rpn")
 set(RPN_CONTACT "Louis Rubet <louis@rubet.fr>")
-set(RPN_FRIENDLY_STRING "rpn - Reverse Polish Notation math language")
+set(RPN_FRIENDLY_STRING "Reverse Polish Notation math language")
 set(RPN_LICENSE "LGPLv3")
 set(RPN_LICENSE_FILE "${PROJECT_SOURCE_DIR}/LICENSE")
 set(RPN_DESCRIPTION_FILE "${PROJECT_SOURCE_DIR}/README.md")
@@ -33,16 +58,16 @@ endif()
 
 # custom linenoise-ng
 if(NOT EXISTS "${PROJECT_SOURCE_DIR}/linenoise-ng/.git")
-    execute_process(COMMAND git submodule init ${PROJECT_SOURCE_DIR}/linenoise-ng)
-    execute_process(COMMAND git submodule update ${PROJECT_SOURCE_DIR}/linenoise-ng)
-    execute_process(COMMAND git checkout v1.1.1-rpn WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/linenoise-ng)
+    execute_process(command git submodule init ${PROJECT_SOURCE_DIR}/linenoise-ng)
+    execute_process(command git submodule update ${PROJECT_SOURCE_DIR}/linenoise-ng)
+    execute_process(command git checkout v1.1.1-rpn WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/linenoise-ng)
 endif()
 
 # custom mpreal
 if(NOT EXISTS "${PROJECT_SOURCE_DIR}/mpreal/.git")
-    execute_process(COMMAND git submodule init ${PROJECT_SOURCE_DIR}/mpreal)
-    execute_process(COMMAND git submodule update ${PROJECT_SOURCE_DIR}/mpreal)
-    execute_process(COMMAND git checkout mpfrc++-3.6.9 WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/mpreal)
+    execute_process(command git submodule init ${PROJECT_SOURCE_DIR}/mpreal)
+    execute_process(command git submodule update ${PROJECT_SOURCE_DIR}/mpreal)
+    execute_process(command git checkout mpfrc++-3.6.9 WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/mpreal)
 endif()
 
 # includes
@@ -74,45 +99,17 @@ add_executable(
   ${PROJECT_SOURCE_DIR}/linenoise-ng/src/linenoise.cpp
   ${PROJECT_SOURCE_DIR}/linenoise-ng/src/wcwidth.cpp
 )
+
 target_link_libraries(rpn mpfr)
 target_link_libraries(rpn gmp)
 
 # man
 add_custom_target(man ALL)
 add_custom_command(
-    TARGET man
-    COMMAND gzip -f -k ${CMAKE_CURRENT_SOURCE_DIR}/doc/rpn.1
-    OUTPUTS ${CMAKE_CURRENT_SOURCE_DIR}/doc/rpn.1.gz
+    OUTPUT ${PROJECT_SOURCE_DIR}/doc/rpn.1.gz
+    COMMAND gzip -f -k ${PROJECT_SOURCE_DIR}/doc/rpn.1
 )
 
 # install
 install(TARGETS rpn DESTINATION bin)
 install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/doc/rpn.1.gz DESTINATION ${CMAKE_INSTALL_PREFIX}/man/man1)
-
-# packages (common variables for all packages)
-set(CPACK_PACKAGE_NAME ${RPN_DISPLAY_NAME})
-set(CPACK_PACKAGE_VENDOR ${RPN_CONTACT})
-set(CPACK_PACKAGE_DESCRIPTION_SUMMARY ${RPN_FRIENDLY_STRING})
-set(CPACK_PACKAGE_DESCRIPTION ${RPN_FRIENDLY_STRING})
-set(CPACK_PACKAGE_DESCRIPTION_FILE ${RPN_DESCRIPTION_FILE})
-set(CPACK_RESOURCE_FILE_LICENSE ${RPN_LICENSE_FILE})
-set(CPACK_RESOURCE_FILE_README ${RPN_DESCRIPTION_FILE})
-
-set(CPACK_PACKAGE_FILE_NAME "${RPN_DISPLAY_NAME}-${RPN_VERSION}-amd64")
-set(CPACK_PACKAGE_VERSION ${RPN_VERSION})
-#set(CPACK_PACKAGE_RELEASE 0)
-set(CPACK_PACKAGE_CONTACT ${RPN_CONTACT})
-set(CPACK_PACKAGE_LICENSE ${RPN_LICENSE})
-set(CPACK_PACKAGING_INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX})
-
-# DEB package
-set(CPACK_GENERATOR "DEB;RPM;TGZ")
-set(CPACK_DEBIAN_PACKAGE_MAINTAINER ${RPN_CONTACT})
-set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE ${SYSTEM_PROCESSOR})
-set(CPACK_DEBIAN_PACKAGE_SECTION "math")
-set(CPACK_DEBIAN_PACKAGE_PRIORITY "optional")
-
-include(CPack)
-
-# RPM package
-set(CPACK_RPM_PACKAGE_REQUIRES "mpfr")
diff --git a/Changelog.md b/Changelog.md
index 18bc9a7..db89c4a 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -22,6 +22,7 @@ Changelog
 - Test files are now markdown (.md) files, tests result are slightly changed
 - Delivery as flatpak and snap
 - error string are slightly different, althought error codes are still the same
+- automatic version string from git, slightly change from previous versions
 
 New
 - `«` and `»` are now valid as program delimiters. `<<` and `>>` are still valid
diff --git a/liv/rpn-2.1-amd64.deb b/liv/rpn-2.1-amd64.deb
deleted file mode 100644
index 9123f61..0000000
Binary files a/liv/rpn-2.1-amd64.deb and /dev/null differ
diff --git a/liv/rpn-2.1-amd64.rpm b/liv/rpn-2.1-amd64.rpm
deleted file mode 100644
index ca849c3..0000000
Binary files a/liv/rpn-2.1-amd64.rpm and /dev/null differ
diff --git a/liv/rpn-2.1-amd64.tar.gz b/liv/rpn-2.1-amd64.tar.gz
deleted file mode 100644
index 60c44a4..0000000
Binary files a/liv/rpn-2.1-amd64.tar.gz and /dev/null differ
diff --git a/liv/rpn-2.2-amd64.deb b/liv/rpn-2.2-amd64.deb
deleted file mode 100644
index 915519f..0000000
Binary files a/liv/rpn-2.2-amd64.deb and /dev/null differ
diff --git a/liv/rpn-2.2-amd64.rpm b/liv/rpn-2.2-amd64.rpm
deleted file mode 100644
index 5cde24e..0000000
Binary files a/liv/rpn-2.2-amd64.rpm and /dev/null differ
diff --git a/liv/rpn-2.2-amd64.tar.gz b/liv/rpn-2.2-amd64.tar.gz
deleted file mode 100644
index 9184c8c..0000000
Binary files a/liv/rpn-2.2-amd64.tar.gz and /dev/null differ
diff --git a/liv/rpn-2.3-amd64.deb b/liv/rpn-2.3-amd64.deb
deleted file mode 100644
index 91db542..0000000
Binary files a/liv/rpn-2.3-amd64.deb and /dev/null differ
diff --git a/liv/rpn-2.3-amd64.rpm b/liv/rpn-2.3-amd64.rpm
deleted file mode 100644
index 1602b7d..0000000
Binary files a/liv/rpn-2.3-amd64.rpm and /dev/null differ
diff --git a/liv/rpn-2.3-amd64.tar.gz b/liv/rpn-2.3-amd64.tar.gz
deleted file mode 100644
index 98a686c..0000000
Binary files a/liv/rpn-2.3-amd64.tar.gz and /dev/null differ
diff --git a/liv/rpn-2.3.1-amd64.deb b/liv/rpn-2.3.1-amd64.deb
deleted file mode 100644
index 74f986a..0000000
Binary files a/liv/rpn-2.3.1-amd64.deb and /dev/null differ
diff --git a/liv/rpn-2.3.1-amd64.rpm b/liv/rpn-2.3.1-amd64.rpm
deleted file mode 100644
index 8096bf0..0000000
Binary files a/liv/rpn-2.3.1-amd64.rpm and /dev/null differ
diff --git a/liv/rpn-2.3.1-amd64.tar.gz b/liv/rpn-2.3.1-amd64.tar.gz
deleted file mode 100644
index d2aae9a..0000000
Binary files a/liv/rpn-2.3.1-amd64.tar.gz and /dev/null differ
diff --git a/liv/rpn-2.3.2-amd64.deb b/liv/rpn-2.3.2-amd64.deb
deleted file mode 100644
index b248645..0000000
Binary files a/liv/rpn-2.3.2-amd64.deb and /dev/null differ
diff --git a/liv/rpn-2.3.2-amd64.rpm b/liv/rpn-2.3.2-amd64.rpm
deleted file mode 100644
index a9fe4cc..0000000
Binary files a/liv/rpn-2.3.2-amd64.rpm and /dev/null differ
diff --git a/liv/rpn-2.3.2-amd64.tar.gz b/liv/rpn-2.3.2-amd64.tar.gz
deleted file mode 100644
index 043ceab..0000000
Binary files a/liv/rpn-2.3.2-amd64.tar.gz and /dev/null differ
diff --git a/src/version.h b/src/version.h
index c05594a..a99959e 100644
--- a/src/version.h
+++ b/src/version.h
@@ -3,7 +3,7 @@
 #ifndef SRC_VERSION_H_
 #define SRC_VERSION_H_
 
-#define RPN_VERSION "2.4"
+#define RPN_VERSION GIT_VERSION  // set by cmake from git tag
 #define RPN_UNAME "rpn v" RPN_VERSION ", (c) 2017 <louis@rubet.fr>, GNU LGPL v3"
 
 #endif  // SRC_VERSION_H_