diff --git a/contrib/devtools/build_depends.sh b/contrib/devtools/build_depends.sh
--- a/contrib/devtools/build_depends.sh
+++ b/contrib/devtools/build_depends.sh
@@ -19,17 +19,7 @@
   mkdir -p "${SDK_PATH}"
   pushd "${SDK_PATH}"
 
-  find . -maxdepth 1 -type d -name "MacOSX*" -exec rm -rf {} \;
-
-  SDK_ARCHIVE_NAME="MacOSX10.14.sdk.tar.gz"
-  OSX_SDK_SHA256="2322086a96349db832abbcadea493b79db843553a2e604163238d99fa058a286"
-
-  OSX_SDK="${SDK_ARCHIVE_DIR}/${SDK_ARCHIVE_NAME}"
-  if ! echo "${OSX_SDK_SHA256}  ${OSX_SDK}" | sha256sum -c; then
-    rm -f "${OSX_SDK}"
-    wget https://storage.googleapis.com/27cd7b2a42a430926cc621acdc3bda72a8ed2b0efc080e3/"${SDK_ARCHIVE_NAME}" -O "${OSX_SDK}"
-    echo "${OSX_SDK_SHA256}  ${OSX_SDK}" | sha256sum -c
-  fi
+  OSX_SDK=$("${TOPLEVEL}/contrib/teamcity/download-apple-sdk.sh" "${SDK_PATH}")
 
   tar -xzf "${OSX_SDK}"
 
diff --git a/contrib/teamcity/download-apple-sdk.sh b/contrib/teamcity/download-apple-sdk.sh
new file mode 100755
--- /dev/null
+++ b/contrib/teamcity/download-apple-sdk.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+export LC_ALL=C
+
+set -euxo pipefail
+
+usage() {
+  echo "Usage: download-apple-sdk.sh dest_dir"
+  echo "Output: prints the SDK file name"
+}
+
+if [ $# -ne 1 ]; then
+  usage
+  exit 1
+fi
+
+DEST_DIR="$1"
+
+: "${TOPLEVEL:=$(git rev-parse --show-toplevel)}"
+
+OSX_SDK="Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers.tar.gz"
+OSX_SDK_SHA256="a1b8af4c4d82d519dd5aff2135fe56184fa758c30e310b5fb4bfc8d9d3b45d8a"
+
+pushd "${DEST_DIR}" > /dev/null
+if ! echo "${OSX_SDK_SHA256}  ${OSX_SDK}" | sha256sum --quiet -c > /dev/null 2>&1; then
+  rm -f "${OSX_SDK}"
+  wget -q https://storage.googleapis.com/27cd7b2a42a430926cc621acdc3bda72a8ed2b0efc080e3/"${OSX_SDK}"
+  echo "${OSX_SDK_SHA256}  ${OSX_SDK}" | sha256sum --quiet -c
+fi
+popd > /dev/null
+
+echo "${OSX_SDK}"
diff --git a/contrib/teamcity/gitian.sh b/contrib/teamcity/gitian.sh
--- a/contrib/teamcity/gitian.sh
+++ b/contrib/teamcity/gitian.sh
@@ -17,17 +17,10 @@
 ./bin/make-base-vm --docker --arch amd64 --distro debian --suite buster
 
 if [[ "${OS_NAME}" == "osx" ]]; then
-  OSX_SDK="Xcode-11.3.1-11C505-extracted-SDK-with-libcxx-headers.tar.gz"
-  OSX_SDK_SHA256="a1b8af4c4d82d519dd5aff2135fe56184fa758c30e310b5fb4bfc8d9d3b45d8a"
   OSX_SDK_DIR=~/.abc-build-cache/osx-sdk
   mkdir -p "${OSX_SDK_DIR}"
-  pushd "${OSX_SDK_DIR}"
-  if ! echo "${OSX_SDK_SHA256}  ${OSX_SDK}" | sha256sum -c; then
-    rm -f "${OSX_SDK}"
-    wget https://storage.googleapis.com/27cd7b2a42a430926cc621acdc3bda72a8ed2b0efc080e3/"${OSX_SDK}"
-    echo "${OSX_SDK_SHA256}  ${OSX_SDK}" | sha256sum -c
-  fi
-  popd
+
+  OSX_SDK=$("${TOPLEVEL}/contrib/teamcity/download-apple-sdk.sh" "${OSX_SDK_DIR}")
 
   mkdir -p inputs
   cp "${OSX_SDK_DIR}/${OSX_SDK}" inputs/"${OSX_SDK}"