diff --git a/.gitattributes b/.gitattributes
index 45273c09c9d..e3c944da39b 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -45,7 +45,7 @@ zap.pl           crlf=input
 # ghostflow-director GitHub automatic check for maximum repository file size
 *                     hooks-max-size=100000
 Modules/Numerics/FEM/src/dsrc2c.c hooks-max-size=260000
-Modules/ThirdParty/** hooks-max-size=300000
+Modules/ThirdParty/** hooks-max-size=300000 hooks.style=
 Modules/ThirdParty/NIFTI/src/nifti/nifti2/nifti2_io.c hooks-max-size=400000
 Modules/ThirdParty/VNL/src/vxl/v3p/netlib/triangle.c hooks-max-size=670000
 Modules/Filtering/Denoising/include/itkPatchBasedDenoisingImageFilter.hxx hooks-max-size=120000
diff --git a/CMake/ITKModuleClangFormat.cmake b/CMake/ITKModuleClangFormat.cmake
index ad5457db6e5..26831151970 100644
--- a/CMake/ITKModuleClangFormat.cmake
+++ b/CMake/ITKModuleClangFormat.cmake
@@ -10,6 +10,6 @@
 option(ITK_USE_CLANG_FORMAT "Enable the use of clang-format for coding style formatting." ${BUILD_TESTING})
 mark_as_advanced(ITK_USE_CLANG_FORMAT)
 
-if(BUILD_TESTING AND ITK_USE_CLANG_FORMAT AND NOT CMAKE_CROSSCOMPILING)
+if(BUILD_TESTING AND ITK_USE_CLANG_FORMAT AND NOT CMAKE_CROSSCOMPILING AND NOT ITK_FORBID_DOWNLOADS)
   include(${ITK_CMAKE_DIR}/../Utilities/ClangFormat/DownloadClangFormat.cmake)
 endif()
diff --git a/Utilities/Hooks/pre-commit-style.bash b/Utilities/Hooks/pre-commit-style.bash
index 2a8070a8d92..b17009043f8 100644
--- a/Utilities/Hooks/pre-commit-style.bash
+++ b/Utilities/Hooks/pre-commit-style.bash
@@ -28,18 +28,9 @@ die() {
           exit 1
 }
 
-do_KWStyle=$(git config --bool hooks.KWStyle) || do_KWStyle=false
+do_KWStyle=$(git config --bool hooks.KWStyle) || do_KWStyle=true
 
-do_clangformat=$(git config --bool hooks.clangformat) || do_clangformat=false
-
-if [ "$(uname)" == "Darwin" ]; then
-    console="</dev/tty" # MacOSX
-elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
-    console="</dev/tty" # Linuxes
-else
-    echo "uname: "$(uname -a)
-    console="" # Windows (Msys, MinGW, Cygwin etc)
-fi
+do_clangformat=$(git config --bool hooks.clangformat) || do_clangformat=true
 
 #-----------------------------------------------------------------------------
 # Check if we want to run the style on a given file.  Uses git attributes.  If
@@ -54,7 +45,16 @@ run_style_on_file() {
   if git diff-index --cached HEAD -- "$1" | grep -q '^:...... 160000'; then
     return 1
   fi
-  if ! git diff-files --quiet -- "$1"; then
+  style=$(git check-attr hooks.style -- "$1" |
+      sed 's/^[^:]*: hooks.style: //')
+  has_style_attr=1
+  case "$style" in
+    'unset')        has_style_attr=1 ;;
+    'set')          has_style_attr=0 ;;
+    'unspecified')  has_style_attr=1 ;;
+    *)              echo ",$style," | grep -iq ",$2," && has_style_attr=0 ;;
+  esac
+  if ! git diff-files --quiet -- "$1" && test $has_style_attr -eq 0; then
     # A way to always allow skipping.
     skip_unstaged=$(git config --bool hooks.styleSkipUnstaged) ||
     skip_unstaged=false
@@ -79,15 +79,7 @@ Allow skipping the style check for this commit with
     fi
     return 1
   fi
-  style=$(git check-attr hooks.style -- "$1" |
-      sed 's/^[^:]*: hooks.style: //')
-  case "$style" in
-    'unset')        return 1 ;;
-    'set')          return 0 ;;
-    'unspecified')  return 1 ;;
-    *)              echo ",$style," | grep -iq ",$2," && return 0 ;;
-  esac
-  return 1
+  return $has_style_attr
 }
 
 #-----------------------------------------------------------------------------
@@ -140,6 +132,7 @@ run_KWStyle_on_file() {
 Line numbers in the errors shown refer to the file:
 ${1}.kws"
   fi
+  return 0
 }
 
 run_KWStyle() {
@@ -154,14 +147,37 @@ run_KWStyle() {
 #-----------------------------------------------------------------------------
 # clangformat.
 check_for_clangformat() {
-  clangformat_path=$(git config hooks.clangformat.path) ||
-  clangformat_path=$(which clangformat) ||
-  die "clangformat executable was not found.
+  clangformat_required_version=8.0.1
+  system_tools="
+    clang-format-$clangformat_required_version
+    clang-format
+"
+  for tool in $system_tools; do
+    if type -p "$tool" >/dev/null; then
+      system_clang_format="$tool"
+      break
+    fi
+  done
+  clangformat_path=$(git config clangFormat.binary) ||
+  clangformat_path=$(type -p "$system_clang_format" >/dev/null) ||
+  die "clang-format executable was not found.
+
+Please install clang-format version $clangformat_required_version or set the executable location with
 
-Please install clang-format version 8.0 or set the executable location with
+  git config clangFormat.binary /path/to/clang-format
+"
+  if ! "$clangformat_path" --version | grep "clang-format version $clangformat_required_version" >/dev/null 2>/dev/null; then
+    die "clang-format version $clangformat_required_version is required (exactly)
 
-  git config hooks.clangformat.path /path/to/clang-format
-  "
+Set the path the clang-format $clangformat_required_version executable with
+
+  git config clangFormat.binary /path/to/clang-format
+
+or disable the clang-format pre-commit hook with
+
+  git config hooks.clangformat false
+"
+  fi
 }
 
 run_clang_format_check_attr()
@@ -188,7 +204,6 @@ run_clangformat_on_file() {
     # We temporarily change MERGED because the file might already be open, and
     # the text editor may complain.
     MERGED="$NEW_MERGED"
-    cp -- "$BACKUP" "$MERGED"
     cp -- "$BACKUP" "$LOCAL"
 
     run_clang_format_check_attr "$LOCAL" "$REMOTE" "$ERROR_LOG"
@@ -196,28 +211,37 @@ run_clangformat_on_file() {
     if [  $clang_format_status -ne 0 ]; then
       mv -- "$BACKUP" "$OLD_MERGED"
 
-      if test "$merge_keep_temporaries" = "false"; then
+      if $merge_keep_temporaries; then
         rm -f -- "$LOCAL" "$REMOTE" "$BACKUP"
       fi
-      die "error when running clangformat on $OLD_MERGED"
+      die "error when running clang-format on $OLD_MERGED"
     fi
+    cp -- "$REMOTE" "$MERGED"
+
+    if test $(git hash-object -- "$LOCAL") != $(git hash-object -- "$REMOTE"); then
+      if [ "$(uname)" == "Darwin" ]; then
+        run_merge_tool "$merge_tool" "false" </dev/tty
+      elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
+        run_merge_tool "$merge_tool" "false" </dev/tty
+      else
+        run_merge_tool "$merge_tool" "false"
+      fi
+      if [ $? -ne 0 ]; then
+        mv -- "$BACKUP" "$OLD_MERGED"
 
-    if test $(git hash-object -- "$LOCAL") != $(git hash-object -- "$REMOTE") &&
-      ! run_merge_tool "$merge_tool" "false" $console; then
-      mv -- "$BACKUP" "$OLD_MERGED"
+        if $merge_keep_temporaries; then
+          rm -f -- "$LOCAL" "$REMOTE" "$BACKUP" "$NEW_MERGED"
+        fi
 
-      if test "$merge_keep_temporaries" = "false"; then
-        rm -f -- "$LOCAL" "$REMOTE" "$BACKUP" "$NEW_MERGED"
+        die "clang-format merge of $OLD_MERGED failed
+        Error log: $ERROR_LOG"
       fi
-
-      die "clang-format merge of $OLD_MERGED failed
-      Error log: $ERROR_LOG"
     fi
 
     mv -- "$NEW_MERGED" "$OLD_MERGED"
     MERGED="$OLD_MERGED"
 
-    if test "$merge_keep_backup" = "true"; then
+    if $merge_keep_backup; then
       mv -- "$BACKUP" "$MERGED.orig"
     else
       rm -- "$BACKUP"
@@ -226,7 +250,7 @@ run_clangformat_on_file() {
     git add -- "$MERGED"
     rm -f -- "$LOCAL" "$REMOTE" "$BACKUP" "$ERROR_LOG" "$NEW_MERGED"
 
-  fi # end if run clangformat on file
+  fi # end if run clang-format on file
 
   if $do_KWStyle &&
     $have_KWStyle &&
@@ -239,6 +263,13 @@ run_clangformat_on_file() {
 }
 
 run_clangformat() {
+  $do_KWStyle && check_for_KWStyle
+  if test $?; then
+    have_KWStyle=true
+  else
+    have_KWStyle=false
+  fi
+
   merge_tool=$(get_merge_tool "$merge_tool") || die "Merge tool not configured.
 
 Set the merge tool with
@@ -254,13 +285,6 @@ For more information, see
   while read MERGED; do
     run_clangformat_on_file "$MERGED" || return
   done # end for changed files
-
-  $do_KWStyle && check_for_KWStyle
-  if test $?; then
-    have_KWStyle=false
-  else
-    have_KWStyle=true
-  fi
 }
 
 # Do not run during merge commits for now.
diff --git a/Utilities/SetupForDevelopment.sh b/Utilities/SetupForDevelopment.sh
index fde2f503858..d85fa023687 100755
--- a/Utilities/SetupForDevelopment.sh
+++ b/Utilities/SetupForDevelopment.sh
@@ -51,6 +51,10 @@ messages for interaction with Gerrit. Also, removing the "gerrit" and "stage" re
           git remote remove stage
 fi
 
+# Style hook configuration
+git config hooks.KWStyle.conf "Utilities/KWStyle/ITK.kws.xml"
+git config hooks.KWStyle.overwriteRulesConf "Utilities/KWStyle/ITKOverwrite.txt"
+
 # Make sure we are inside the repository.
 cd "$(echo "$0"|sed 's/[^/]*$//')"/..
 
@@ -103,5 +107,5 @@ echo -e "Git version $git_version is OK.\n"
 
 
 # Record the version of this setup so Hooks/pre-commit can check it.
-SetupForDevelopment_VERSION=6
+SetupForDevelopment_VERSION=7
 git config hooks.SetupForDevelopment ${SetupForDevelopment_VERSION}