diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8274416c3..d4e81c7d0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.12)
+cmake_minimum_required(VERSION 3.5.1)
 project(CodeCompass)
 
 # Common config variables and settings
diff --git a/Functions.cmake b/Functions.cmake
index 8b8a52613..c97ce9f8e 100644
--- a/Functions.cmake
+++ b/Functions.cmake
@@ -117,3 +117,11 @@ function(fancy_message _str _colour _isBold)
     ${CMAKE_COMMAND} -E env CLICOLOR_FORCE=1
     ${CMAKE_COMMAND} -E cmake_echo_color ${COLOUR_TAG} ${BOLD_TAG} ${_str})
 endfunction(fancy_message)
+
+# Joins a list of elements with a given glue string.
+# See: https://stackoverflow.com/questions/7172670/best-shortest-way-to-join-a-list-in-cmake
+function(join _values _glue _output)
+  string (REGEX REPLACE "([^\\]|^);" "\\1${_glue}" _tmpStr "${_values}")
+  string (REGEX REPLACE "[\\](.)" "\\1" _tmpStr "${_tmpStr}") #fixes escaping
+  set (${_output} "${_tmpStr}" PARENT_SCOPE)
+endfunction(join)
diff --git a/webgui/InstallGUI.cmake b/webgui/InstallGUI.cmake
index 78445a275..90c63011d 100644
--- a/webgui/InstallGUI.cmake
+++ b/webgui/InstallGUI.cmake
@@ -1,3 +1,6 @@
+# Utility functions
+include(../Functions.cmake)
+
 message("Install npm packages...")
 
 if(${CC_PACKAGE} IS_NEWER_THAN ${INSTALL_SCRIPTS_DIR}/package.json)
@@ -25,7 +28,7 @@ foreach(_jsfile ${_jsfiles})
   string(REGEX REPLACE "\\.js*$" "" _jsfile ${_jsfile})
   list(APPEND DOJO_VIEWLIST "'${_jsfile}'")
 endforeach()
-list(JOIN DOJO_VIEWLIST  ", " DOJO_VIEWLIST)
+join("${DOJO_VIEWLIST}"  ", " DOJO_VIEWLIST)
 
 set(DOJO_OPTIMIZE "")       # optimization for non-layer modules
 set(DOJO_LAYEROPTIMIZE "")  # optimization for layer modules