diff --git a/contrib/build-wine/prepare-wine.sh b/contrib/build-wine/prepare-wine.sh
index f9e6941f0..7fb3b3cd8 100755
--- a/contrib/build-wine/prepare-wine.sh
+++ b/contrib/build-wine/prepare-wine.sh
@@ -24,62 +24,12 @@ PYHOME="c:/$PYTHON_FOLDER"
 PYTHON="wine $PYHOME/python.exe -OO -B"
 
 
-# based on https://superuser.com/questions/497940/script-to-verify-a-signature-with-gpg
-verify_signature() {
-    local file=$1 keyring=$2 out=
-    if out=$(gpg --no-default-keyring --keyring "$keyring" --status-fd 1 --verify "$file" 2>/dev/null) &&
-       echo "$out" | grep -qs "^\[GNUPG:\] VALIDSIG "; then
-        return 0
-    else
-        echo "$out" >&2
-        exit 1
-    fi
-}
-
-verify_hash() {
-    local file=$1 expected_hash=$2
-    actual_hash=$(sha256sum $file | awk '{print $1}')
-    if [ "$actual_hash" == "$expected_hash" ]; then
-        return 0
-    else
-        echo "$file $actual_hash (unexpected hash)" >&2
-        rm "$file"
-        exit 1
-    fi
-}
-
-download_if_not_exist() {
-    local file_name=$1 url=$2
-    if [ ! -e $file_name ] ; then
-        wget -O $PWD/$file_name "$url"
-    fi
-}
-
-# https://github.com/travis-ci/travis-build/blob/master/lib/travis/build/templates/header.sh
-retry() {
-  local result=0
-  local count=1
-  while [ $count -le 3 ]; do
-    [ $result -ne 0 ] && {
-      echo -e "\nThe command \"$@\" failed. Retrying, $count of 3.\n" >&2
-    }
-    ! { "$@"; result=$?; }
-    [ $result -eq 0 ] && break
-    count=$(($count + 1))
-    sleep 1
-  done
-
-  [ $count -gt 3 ] && {
-    echo -e "\nThe command \"$@\" failed 3 times.\n" >&2
-  }
-
-  return $result
-}
-
 # Let's begin!
-here=$(dirname $(readlink -e $0))
+here="$(dirname "$(readlink -e "$0")")"
 set -e
 
+. $here/../build_tools_util.sh
+
 wine 'wineboot'
 
 # HACK to work around https://bugs.winehq.org/show_bug.cgi?id=42474#c22
diff --git a/contrib/build_tools_util.sh b/contrib/build_tools_util.sh
new file mode 100755
index 000000000..94d2cdbe9
--- /dev/null
+++ b/contrib/build_tools_util.sh
@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+
+RED='\033[0;31m'
+BLUE='\033[0;34m'
+YELLOW='\033[0;33m'
+NC='\033[0m' # No Color
+function info {
+    printf "\r💬 ${BLUE}INFO:${NC}  ${1}\n"
+}
+function fail {
+    printf "\r🗯 ${RED}ERROR:${NC} ${1}\n"
+    exit 1
+}
+function warn {
+    printf "\r⚠️  ${YELLOW}WARNING:${NC}  ${1}\n"
+}
+
+
+# based on https://superuser.com/questions/497940/script-to-verify-a-signature-with-gpg
+function verify_signature() {
+    local file=$1 keyring=$2 out=
+    if out=$(gpg --no-default-keyring --keyring "$keyring" --status-fd 1 --verify "$file" 2>/dev/null) &&
+       echo "$out" | grep -qs "^\[GNUPG:\] VALIDSIG "; then
+        return 0
+    else
+        echo "$out" >&2
+        exit 1
+    fi
+}
+
+function verify_hash() {
+    local file=$1 expected_hash=$2
+    actual_hash=$(sha256sum $file | awk '{print $1}')
+    if [ "$actual_hash" == "$expected_hash" ]; then
+        return 0
+    else
+        echo "$file $actual_hash (unexpected hash)" >&2
+        rm "$file"
+        exit 1
+    fi
+}
+
+function download_if_not_exist() {
+    local file_name=$1 url=$2
+    if [ ! -e $file_name ] ; then
+        wget -O $file_name "$url"
+    fi
+}
+
+# https://github.com/travis-ci/travis-build/blob/master/lib/travis/build/templates/header.sh
+function retry() {
+  local result=0
+  local count=1
+  while [ $count -le 3 ]; do
+    [ $result -ne 0 ] && {
+      echo -e "\nThe command \"$@\" failed. Retrying, $count of 3.\n" >&2
+    }
+    ! { "$@"; result=$?; }
+    [ $result -eq 0 ] && break
+    count=$(($count + 1))
+    sleep 1
+  done
+
+  [ $count -gt 3 ] && {
+    echo -e "\nThe command \"$@\" failed 3 times.\n" >&2
+  }
+
+  return $result
+}
diff --git a/contrib/osx/base.sh b/contrib/osx/base.sh
index 2c22ca9cf..c2e3527c0 100644
--- a/contrib/osx/base.sh
+++ b/contrib/osx/base.sh
@@ -1,19 +1,7 @@
 #!/usr/bin/env bash
 
-RED='\033[0;31m'
-BLUE='\033[0,34m'
-YELLOW='\033[0;33m'
-NC='\033[0m' # No Color
-function info {
-	printf "\r💬 ${BLUE}INFO:${NC}  ${1}\n"
-}
-function fail {
-    printf "\r🗯 ${RED}ERROR:${NC} ${1}\n"
-    exit 1
-}
-function warn {
-	printf "\r⚠️  ${YELLOW}WARNING:${NC}  ${1}\n"
-}
+. $(dirname "$0")/../build_tools_util.sh
+
 
 function DoCodeSignMaybe { # ARGS: infoName fileOrDirName codesignIdentity
     infoName="$1"