diff --git a/.github/workflows/nightly_posix.yml b/.github/workflows/nightly_posix.yml
index 7ac0c1c26..bc056d3e7 100644
--- a/.github/workflows/nightly_posix.yml
+++ b/.github/workflows/nightly_posix.yml
@@ -23,6 +23,9 @@ jobs:
         toolchain: ${{ matrix.rust_toolchain }}
         override: true
         components: rustfmt
+    - name: Set macOS deployment target
+      run: |
+        echo "::set-env name=MACOSX_DEPLOYMENT_TARGET=10.9"
     - name: Cache cargo registry
       uses: actions/cache@v1
       with:
diff --git a/.github/workflows/posix.yml b/.github/workflows/posix.yml
index ce802334a..5d207069c 100644
--- a/.github/workflows/posix.yml
+++ b/.github/workflows/posix.yml
@@ -27,6 +27,9 @@ jobs:
         toolchain: ${{ matrix.rust_toolchain }}
         override: true
         components: rustfmt
+    - name: Set macOS deployment target
+      run: |
+        echo "::set-env name=MACOSX_DEPLOYMENT_TARGET=10.9"
     - name: Show versions
       run: |
         rustc -V
diff --git a/.github/workflows/tag_posix.yml b/.github/workflows/tag_posix.yml
index 0458b9616..a1d6017c6 100644
--- a/.github/workflows/tag_posix.yml
+++ b/.github/workflows/tag_posix.yml
@@ -23,6 +23,9 @@ jobs:
         profile: minimal
         toolchain: ${{ matrix.rust_toolchain }}
         override: true
+    - name: Set macOS deployment target
+      run: |
+        echo "::set-env name=MACOSX_DEPLOYMENT_TARGET=10.9"
     - name: Cache cargo registry
       uses: actions/cache@v1
       with:
diff --git a/deps/freetype/build.rs b/deps/freetype/build.rs
index 3558facb0..b0bc49bda 100644
--- a/deps/freetype/build.rs
+++ b/deps/freetype/build.rs
@@ -2,6 +2,13 @@ use std::env;
 use std::fs;
 use std::path::{Path, PathBuf};
 
+fn new_build() -> cc::Build {
+    let mut cfg = cc::Build::new();
+    cfg.warnings(false);
+    cfg.flag_if_supported("-fno-stack-check");
+    cfg
+}
+
 fn zlib() {
     if !Path::new("zlib/.git").exists() {
         git_submodule_update();
@@ -9,8 +16,7 @@ fn zlib() {
 
     let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
 
-    let mut cfg = cc::Build::new();
-    cfg.warnings(false);
+    let mut cfg = new_build();
     let build_dir = out_dir.join("zlib-build");
     fs::create_dir_all(&build_dir).unwrap();
     cfg.out_dir(&build_dir);
@@ -47,8 +53,7 @@ fn libpng() {
 
     let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
 
-    let mut cfg = cc::Build::new();
-    cfg.warnings(false);
+    let mut cfg = new_build();
     let build_dir = out_dir.join("png-build");
     fs::create_dir_all(&build_dir).unwrap();
     cfg.out_dir(&build_dir);
@@ -96,8 +101,7 @@ fn freetype() {
 
     let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
 
-    let mut cfg = cc::Build::new();
-    cfg.warnings(false);
+    let mut cfg = new_build();
     let build_dir = out_dir.join("freetype-build");
     fs::create_dir_all(&build_dir).unwrap();
     cfg.out_dir(&build_dir);
@@ -219,4 +223,5 @@ fn main() {
     freetype();
     let out_dir = env::var("OUT_DIR").unwrap();
     println!("cargo:outdir={}", out_dir);
+    println!("cargo:rustc-env=MACOSX_DEPLOYMENT_TARGET=10.9");
 }
diff --git a/deps/harfbuzz/build.rs b/deps/harfbuzz/build.rs
index c55f971c1..07cda3053 100644
--- a/deps/harfbuzz/build.rs
+++ b/deps/harfbuzz/build.rs
@@ -17,6 +17,7 @@ fn harfbuzz() {
     cfg.flag_if_supported("-fno-exceptions");
     cfg.flag_if_supported("-fno-threadsafe-statics");
     cfg.flag_if_supported("-std=c++11");
+    cfg.flag_if_supported("-fno-stack-check");
 
     let build_dir = out_dir.join("harfbuzz-build");
     fs::create_dir_all(&build_dir).unwrap();
@@ -139,4 +140,5 @@ fn main() {
     harfbuzz();
     let out_dir = env::var("OUT_DIR").unwrap();
     println!("cargo:outdir={}", out_dir);
+    println!("cargo:rustc-env=MACOSX_DEPLOYMENT_TARGET=10.9");
 }