diff --git a/pcbnew/CMakeLists.txt b/pcbnew/CMakeLists.txt
index 06c80c5917..c57e4dbfad 100644
--- a/pcbnew/CMakeLists.txt
+++ b/pcbnew/CMakeLists.txt
@@ -487,9 +487,12 @@ add_custom_command( OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/pcbnew_wrap.cxx
     COMMAND ${SWIG_EXECUTABLE}
         ${SWIG_OPTS} -o ${CMAKE_CURRENT_BINARY_DIR}/pcbnew_wrap.cxx ${CMAKE_SOURCE_DIR}/pcbnew/python/swig/pcbnew.i
 
-    COMMAND ${PYTHON_EXECUTABLE}
-        ${CMAKE_SOURCE_DIR}/scripting/build_tools/fix_swig_imports.py
-        ${CMAKE_CURRENT_BINARY_DIR}/pcbnew.py
+    # was needed only with SWIG version < 4 to disable a python section "def swig_import_helper()"
+    # found in pcbnew.py but not existing in SWIG version >= 4
+    # So it is left here for documentation purpose
+    #COMMAND ${PYTHON_EXECUTABLE}
+    #    ${CMAKE_SOURCE_DIR}/tools/build/fix_swig_imports.py ${CMAKE_CURRENT_BINARY_DIR}/pcbnew.py
+
 
     WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
     )
diff --git a/scripting/build_tools/fix_swig_imports.py b/scripting/build_tools/fix_swig_imports.py
index a869d6dcf6..6c393cd985 100644
--- a/scripting/build_tools/fix_swig_imports.py
+++ b/scripting/build_tools/fix_swig_imports.py
@@ -1,13 +1,15 @@
 #!/usr/bin/env python
 
 # the purpose of this script is rewriting the swig_import_helper
-# call so it will not load _xxxxx.so/dso from inside a kicad executable
+# call added by Swig version < 4.0 in pcbnew.py so it will not load
+# _xxxxx.so/dso from inside a kicad executable
 # because the kicad executable itself sill provide an _xxxxx module
 # that's linked inside itself.
 #
 # for the normal module import it should work the same way with this
 # fix in the swig_import_helper
 #
+# For Swig version >= 4.0 this method does not exist so nothing useful is made
 
 from __future__ import print_function
 
diff --git a/scripting/build_tools/get_libngspice_so.sh b/scripting/build_tools/get_libngspice_so.sh
deleted file mode 100755
index f69f775ca4..0000000000
--- a/scripting/build_tools/get_libngspice_so.sh
+++ /dev/null
@@ -1,145 +0,0 @@
-#!/bin/bash
-
-# author: Maciej Suminski <maciej.suminski@cern.ch>
-# contributors: madworm, imcinerney, dimtass
-
-# Set to 1 to pull the tag given by NGSPICE_GIT_TAG
-# Set to 0 to pull the commit with the has given by NGSPICE_GIT_HASH
-USE_GIT_TAG=1
-
-NGSPICE_GIT_TAG="ngspice-31.3"
-NGSPICE_GIT_HASH="33985ae1e5eff44065a52bea45489a1dba0af8f3"
-
-NGSPICE_GIT="https://git.code.sf.net/p/ngspice/ngspice"
-
-BUILD_DIR="/tmp/libngspice_so"
-SRC_DIR="${BUILD_DIR}/ngspice"
-
-NPROC=1
-
-if [ -n "${MINGW_PREFIX}" ]; then
-    OSTYPE="mingw"
-fi
-
-case "${OSTYPE}" in
-    "linux"*)
-        CFG_OPTIONS="--enable-openmp"
-        ;;
-
-    "darwin"*)      # OS X
-        # ngspice requires bison 2.7, the one in /usr/bin is 2.3
-        export PATH="$(find /usr/local/Cellar/bison -name bin):${PATH}"
-        ;;
-
-    "mingw"*)
-        CFG_OPTIONS="--prefix ${MINGW_PREFIX} --enable-openmp"
-        ;;
-
-    *)
-        echo "ERROR: Could not detect the operating system type."
-        echo
-        echo "Run:"
-        echo "OSTYPE=type ${0}"
-        echo "where 'type' is linux (Linux), darwin (OSX) or mingw (MinGW)"
-        exit 1
-        ;;
-esac
-
-while getopts "c:ah" option; do
-    case "${option}"
-    in
-        c) NPROC=${OPTARG};;    # number of cores
-        a) NPROC=$(nproc);;     # all threads
-        h) cat <<EOF
-    Usage: ${0} [-c Cores] [-a All Cores]
-
-    -c Cores        Number of cores/threads to use for make (default: 1)
-    -a All Cores    Use all available cores/threads
-    -h Help         This help
-EOF
-    exit 0
-    esac
-done
-
-
-if [ "$1" = "install" ]; then
-    if [ -d ${SRC_DIR} ]; then
-	cd ${SRC_DIR}
-    else
-	echo "*** ngspice has not been built yet"
-        exit 1
-    fi
-    make install
-
-    echo "*** Installation completed successfully! ***"
-    exit 0
-fi
-
-
-if [ "$1" = "uninstall" ]; then
-    if [ -d ${SRC_DIR} ]; then
-	cd ${SRC_DIR}
-    else
-	echo "*** ngspice has not been built yet"
-        exit 1
-    fi
-    make uninstall
-
-    echo "*** Uninstallation completed successfully! ***"
-    exit 0
-fi
-
-
-[ -d "${BUILD_DIR}" ] && rm -rf "${BUILD_DIR}"
-mkdir -p "${BUILD_DIR}"
-cd "${BUILD_DIR}" || exit
-
-echo "libngspice (for KiCad) builder v1.2"
-echo "(c) CERN 2016"
-echo "author: Maciej Suminski <maciej.suminski@cern.ch>"
-echo "contributors: madworm, imcinerney, dimtass"
-echo
-echo "PREREQUISITES: autoconf automake bison flex gcc git libtool make"
-echo
-
-echo "*** Downloading ngspice source code.. ***"
-git clone ${NGSPICE_GIT}
-
-if [ $? != 0 ]; then
-    echo "*** An error occurred when downloading the source code ***"
-    exit 1
-fi
-
-if [ -d ${SRC_DIR} ]; then
-    cd "${SRC_DIR}"
-else
-    echo "*** An error occurred when downloading the source code ***"
-    exit 1
-fi
-
-echo "*** Building libngspice shared library using ${NPROC} core(s).. ***"
-if [ $USE_GIT_TAG == 1 ]; then
-    echo "*** Checking out tag ${NGSPICE_GIT_TAG} ***"
-    git checkout tags/${NGSPICE_GIT_TAG}
-else
-    echo "*** Checking out git commit ${NGSPICE_GIT_HASH} ***"
-    git checkout ${NGSPICE_GIT_HASH}
-fi
-
-./autogen.sh
-./configure --with-ngshared --enable-xspice --enable-cider ${CFG_OPTIONS}
-make -j${NPROC}
-
-if [ $? != 0 ]; then
-    echo "*** Build failed ***"
-    exit 1
-fi
-
-echo
-echo "*** ngspice shared library has been built successfully! ***"
-echo
-echo "Now, to finish the installation run the script as root with 'install' parameter:"
-echo "sudo $0 install"
-echo
-echo "It can be uninstalled with 'uninstall' parameter:"
-echo "sudo $0 uninstall"