diff --git a/bin/install_libs.py b/bin/install_libs.py
new file mode 100644
index 0000000..32532aa
--- /dev/null
+++ b/bin/install_libs.py
@@ -0,0 +1,60 @@
+# nxpy ------------------------------------------------------------------------
+
+# Copyright Nicola Musatti 2024
+# Use, modification, and distribution are subject to the Boost Software
+# License, Version 1.0. (See accompanying file LICENSE.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# See https://github.com/nmusatti/nxpy. ---------------------------------------
+
+r"""
+Use pip to install all libraries.
+
+"""
+import os
+import subprocess
+import sys
+
+from six import iteritems
+
+SOURCES = {
+  'nxpy_abstract'               : 'libs/abstract',
+  'nxpy_backup_file'            : 'libs/backup_file',
+  'nxpy_command'                : 'libs/command',
+  'nxpy_core'                   : 'libs/core',
+  'nxpy_file'                   : 'libs/file',
+  'nxpy_file_object'            : 'libs/file_object',
+  'nxpy_maven'                  : 'libs/maven',
+  'nxpy_memo'                   : 'libs/memo',
+  'nxpy_nonblocking_subprocess' : 'libs/nonblocking_subprocess',
+  'nxpy_past'                   : 'libs/past',
+  'nxpy_path'                   : 'libs/path',
+  'nxpy_ply'                    : 'libs/ply',
+  'nxpy_sequence'               : 'libs/sequence',
+  'nxpy_sort'                   : 'libs/sort',
+  'nxpy_svn'                    : 'libs/svn',
+  'nxpy_temp_file'              : 'libs/temp_file',
+  'nxpy_test'                   : 'libs/test',
+  'nxpy_xml'                    : 'libs/xml',
+}
+
+def install_libs(sources, develop=False):
+    print("installing all libs in {} mode".format(
+              "development" if develop else "normal"))
+    wd = os.getcwd()
+    for k, v in iteritems(sources):
+        try:
+            os.chdir(os.path.join(wd, v))
+            if develop:
+                subprocess.call([sys.executable, '-m', 'pip', 'install', '-e', '.'])
+            else:
+                subprocess.call([sys.executable, '-m', 'pip', 'install', '.'])
+        except Exception as e:
+            print("Oops, something went wrong installing", k)
+            print(e)
+        finally:
+            os.chdir(wd)
+
+if __name__ == '__main__':
+    develop = len(sys.argv) == 2 and sys.argv[1] in ( "-d", "--develop")
+    install_libs(SOURCES, develop)
diff --git a/libs/abstract/pyproject.toml b/libs/abstract/pyproject.toml
index 9e84b92..3e3658b 100644
--- a/libs/abstract/pyproject.toml
+++ b/libs/abstract/pyproject.toml
@@ -1,3 +1,12 @@
+# nxpy_abstract ---------------------------------------------------------------
+
+# Copyright Nicola Musatti 2024
+# Use, modification, and distribution are subject to the Boost Software
+# License, Version 1.0. (See accompanying file LICENSE.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# See https://github.com/nmusatti/nxpy/tree/master/libs/abstract. -------------
+
 [build-system]
 #requires = ["hatchling"]
 #build-backend = "hatchling.build"
@@ -9,7 +18,7 @@ name = "nxpy-abstract"
 dynamic = ["version"]
 description = "Abstract class helpers"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/backup_file/pyproject.toml b/libs/backup_file/pyproject.toml
index f884fc3..f397d71 100644
--- a/libs/backup_file/pyproject.toml
+++ b/libs/backup_file/pyproject.toml
@@ -1,13 +1,24 @@
+# nxpy_backup_file ------------------------------------------------------------
+
+# Copyright Nicola Musatti 2024
+# Use, modification, and distribution are subject to the Boost Software
+# License, Version 1.0. (See accompanying file LICENSE.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# See https://github.com/nmusatti/nxpy/tree/master/libs/backup_file. ----------
+
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-backup-file"
 dynamic = ["version"]
 description = "A file-like object that keeps a copy of the file being edited"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/command/pyproject.toml b/libs/command/pyproject.toml
index 6a95eb1..6b4b26b 100644
--- a/libs/command/pyproject.toml
+++ b/libs/command/pyproject.toml
@@ -1,13 +1,24 @@
+# nxpy_command ----------------------------------------------------------------
+
+# Copyright Nicola Musatti 2024
+# Use, modification, and distribution are subject to the Boost Software
+# License, Version 1.0. (See accompanying file LICENSE.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# See https://github.com/nmusatti/nxpy/tree/master/libs/command. --------------
+
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-command"
 dynamic = ["version"]
 description = "Wrap programs to call them as Python methods"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/core/pyproject.toml b/libs/core/pyproject.toml
index 8a99382..f57da35 100644
--- a/libs/core/pyproject.toml
+++ b/libs/core/pyproject.toml
@@ -1,13 +1,24 @@
+# nxpy_core -------------------------------------------------------------------
+
+# Copyright Nicola Musatti 2024
+# Use, modification, and distribution are subject to the Boost Software
+# License, Version 1.0. (See accompanying file LICENSE.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# See https://github.com/nmusatti/nxpy/tree/master/libs/core. -----------------
+
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-core"
 dynamic = ["version"]
 description = "Infrastructure common to the Nxpy libraries"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/file/pyproject.toml b/libs/file/pyproject.toml
index 1e83193..efa007c 100644
--- a/libs/file/pyproject.toml
+++ b/libs/file/pyproject.toml
@@ -1,13 +1,24 @@
+# nxpy_file -------------------------------------------------------------------
+
+# Copyright Nicola Musatti 2024
+# Use, modification, and distribution are subject to the Boost Software
+# License, Version 1.0. (See accompanying file LICENSE.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# See https://github.com/nmusatti/nxpy/tree/master/libs/file. -----------------
+
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-file"
 dynamic = ["version"]
 description = "File manipulation utilities"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/file_object/pyproject.toml b/libs/file_object/pyproject.toml
index 708e5bf..dd5ebc0 100644
--- a/libs/file_object/pyproject.toml
+++ b/libs/file_object/pyproject.toml
@@ -1,13 +1,24 @@
+# nxpy_file_object ------------------------------------------------------------
+
+# Copyright Nicola Musatti 2024
+# Use, modification, and distribution are subject to the Boost Software
+# License, Version 1.0. (See accompanying file LICENSE.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# See https://github.com/nmusatti/nxpy/tree/master/libs/file_object. ----------
+
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-file-object"
 dynamic = ["version"]
 description = "Helper classes to implement file-like objects"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/maven/pyproject.toml b/libs/maven/pyproject.toml
index 4b3119b..36aa202 100644
--- a/libs/maven/pyproject.toml
+++ b/libs/maven/pyproject.toml
@@ -1,13 +1,24 @@
+# nxpy_maven ------------------------------------------------------------------
+
+# Copyright Nicola Musatti 2024
+# Use, modification, and distribution are subject to the Boost Software
+# License, Version 1.0. (See accompanying file LICENSE.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# See https://github.com/nmusatti/nxpy/tree/master/libs/maven. ----------------
+
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-maven"
 dynamic = ["version"]
 description = "Utilities for the Maven build tool"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/memo/pyproject.toml b/libs/memo/pyproject.toml
index 6ae718d..c42fcb5 100644
--- a/libs/memo/pyproject.toml
+++ b/libs/memo/pyproject.toml
@@ -1,13 +1,24 @@
+# nxpy_memo -------------------------------------------------------------------
+
+# Copyright Nicola Musatti 2024
+# Use, modification, and distribution are subject to the Boost Software
+# License, Version 1.0. (See accompanying file LICENSE.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# See https://github.com/nmusatti/nxpy/tree/master/libs/memo. -----------------
+
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-memo"
 dynamic = ["version"]
 description = "Base class to implement self-memoizing types"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/nonblocking_subprocess/pyproject.toml b/libs/nonblocking_subprocess/pyproject.toml
index b20bfb1..c55a51c 100644
--- a/libs/nonblocking_subprocess/pyproject.toml
+++ b/libs/nonblocking_subprocess/pyproject.toml
@@ -1,13 +1,24 @@
+# nxpy_nonblocking_subprocess -------------------------------------------------
+
+# Copyright Nicola Musatti 2024
+# Use, modification, and distribution are subject to the Boost Software
+# License, Version 1.0. (See accompanying file LICENSE.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# See https://github.com/nmusatti/nxpy/tree/master/libs/nonblocking_subprocess. 
+
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-nonblocking-subprocess"
 dynamic = ["version"]
 description = "subprocess.Popen subclass using non-blocking I/O"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/past/pyproject.toml b/libs/past/pyproject.toml
index 61f4230..b07f12d 100644
--- a/libs/past/pyproject.toml
+++ b/libs/past/pyproject.toml
@@ -1,13 +1,15 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-past"
 dynamic = ["version"]
 description = "Python version based conditionals"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/path/pyproject.toml b/libs/path/pyproject.toml
index 6de9ce2..0d148a6 100644
--- a/libs/path/pyproject.toml
+++ b/libs/path/pyproject.toml
@@ -1,13 +1,15 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-path"
 dynamic = ["version"]
 description = "Wrap programs to call them as Python methods"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/ply/pyproject.toml b/libs/ply/pyproject.toml
index 7be5668..5765c89 100644
--- a/libs/ply/pyproject.toml
+++ b/libs/ply/pyproject.toml
@@ -1,13 +1,15 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-ply"
 dynamic = ["version"]
 description = "Utilities for the PLY parser generator"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/sequence/pyproject.toml b/libs/sequence/pyproject.toml
index 01fa0b7..ef37746 100644
--- a/libs/sequence/pyproject.toml
+++ b/libs/sequence/pyproject.toml
@@ -1,13 +1,15 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-sequence"
 dynamic = ["version"]
 description = "Sequence related tools"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/sort/pyproject.toml b/libs/sort/pyproject.toml
index a9a3d8c..dfbea63 100644
--- a/libs/sort/pyproject.toml
+++ b/libs/sort/pyproject.toml
@@ -1,13 +1,15 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-sort"
 dynamic = ["version"]
 description = "Sorting utilities"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/svn/pyproject.toml b/libs/svn/pyproject.toml
index 71c227b..550d0ea 100644
--- a/libs/svn/pyproject.toml
+++ b/libs/svn/pyproject.toml
@@ -1,13 +1,15 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-svn"
 dynamic = ["version"]
 description = "Python wrapper for Subversion"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/temp_file/pyproject.toml b/libs/temp_file/pyproject.toml
index 4addb74..4c694cf 100644
--- a/libs/temp_file/pyproject.toml
+++ b/libs/temp_file/pyproject.toml
@@ -1,13 +1,15 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-temp-file"
 dynamic = ["version"]
 description = "Temporary file and directory handling"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/test/pyproject.toml b/libs/test/pyproject.toml
index c98177d..ce51a9e 100644
--- a/libs/test/pyproject.toml
+++ b/libs/test/pyproject.toml
@@ -1,13 +1,15 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-test"
 dynamic = ["version"]
 description = "Test related utilities for the Nxpy libraries"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/libs/xml/pyproject.toml b/libs/xml/pyproject.toml
index 8ba9470..47e73da 100644
--- a/libs/xml/pyproject.toml
+++ b/libs/xml/pyproject.toml
@@ -1,13 +1,15 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "nxpy-xml"
 dynamic = ["version"]
 description = "Utilities for the Lxml library"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/pyproject.toml b/pyproject.toml
index beda8a3..8259f0d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,13 +1,18 @@
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+#requires = ["hatchling"]
+#build-backend = "hatchling.build"
+requires = [
+	"setuptools",
+	"six"
+]
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "Nxpy"
 dynamic = ["version"]
 description = "Nick's Python Toolbox"
 readme = "README.rst"
-license = "Boost Software License 1.0 (BSL-1.0)"
+license.file = "LICENSE.txt"
 authors = [
     { name = "Nicola Musatti", email = "nicola.musatti@gmail.com" },
 ]
diff --git a/test/bin/setup_test_env.py b/test/bin/setup_test_env.py
index 1108c0e..0ae9aa0 100644
--- a/test/bin/setup_test_env.py
+++ b/test/bin/setup_test_env.py
@@ -43,6 +43,8 @@ def main(msgs=False):
     except KeyError:
         env_dir = ""
     base_dest_dir = ""
+    if len(sys.argv) == 2:
+        env_dir = sys.argv[1]
     if msgs:
         base_dest_dir = input("Test data directory [" + env_dir + "]: ")
         six.print_("Directory:", base_dest_dir)
diff --git a/tox.ini b/tox.ini
index 1f2bb33..3c09490 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 4.0
-envlist = py{27,37,38,39,310,311}-{mylinux,mymacos,mywindows}
+envlist = py{27,38,39,310,311,312}-{mylinux,mymacos,mywindows}
 
 [testenv]
 platform = 
@@ -8,17 +8,18 @@ platform =
   mymacos:   darwin
   mywindows: win32
 
-setenv =
-  mylinux,mymacos: NXPY_TEST_DIR = {toxinidir}/tmp/nxpy
-  mywindows:       NXPY_TEST_DIR = {toxinidir}\tmp\nxpy
+set_env =
+  mylinux, mymacos: NXPY_TEST_DIR={toxinidir}/tmp/nxpy
+  mywindows: NXPY_TEST_DIR={toxinidir}\tmp\nxpy
 
-passenv =
+pass_env =
   JAVA_HOME
-  mywindows: USERNAME
   M2_HOME
+  mywindows: USERNAME
 
 allowlist_externals = 
   mkdir
+  mvn
 
 deps =
   pytest
@@ -26,8 +27,9 @@ deps =
   six
 
 commands =
-  pip install -e .
-  mylinux,mymacos: -mkdir -p {toxinidir}/tmp/nxpy
-  mywindows: -mkdir {toxinidir}\tmp\nxpy
-  python test/bin/setup_test_env.py
-  python -m pytest --color=yes libs -s
+    python bin/install_libs.py -d
+    mylinux, mymacos: -mkdir -p {toxinidir}/tmp/nxpy
+    mywindows: -mkdir -p {toxinidir}\tmp\nxpy
+    mylinux, mymacos: python test/bin/setup_test_env.py
+    mywindows: python test/bin/setup_test_env.py
+    python -m pytest --color=yes libs -s