diff --git a/procgen/CMakeLists.txt b/procgen/CMakeLists.txt
index 31084aa5..3693e42a 100644
--- a/procgen/CMakeLists.txt
+++ b/procgen/CMakeLists.txt
@@ -26,8 +26,14 @@ endif()
 
 if (APPLE OR UNIX)
   if(PROCGEN_PACKAGE)
-    # compile for the minimum spec processor
-    set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -march=ivybridge")
+    # compile for the minimum spec processor (for a portable wheel)
+    if(CMAKE_SYSTEM_PROCESSOR MATCHES "arm64|aarch64")
+      # -march=ivybridge is an x86-only microarch and is rejected by arm64 clang;
+      # use the base armv8-a ISA so the wheel stays portable across Apple Silicon / aarch64.
+      set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -march=armv8-a")
+    else()
+      set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -march=ivybridge")
+    endif()
   else()
     set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -march=native")
   endif()
diff --git a/procgen/builder.py b/procgen/builder.py
index 53a6eef3..83dc128e 100644
--- a/procgen/builder.py
+++ b/procgen/builder.py
@@ -54,7 +54,11 @@ def _attempt_configure(build_type, package):
         cmake_prefix_paths = [os.environ["PROCGEN_CMAKE_PREFIX_PATH"]]
     else:
         # guess some common qt cmake paths, it's unclear why cmake can't find qt without this
-        cmake_prefix_paths = ["/usr/local/opt/qt5/lib/cmake"]
+        # (Apple Silicon Homebrew installs qt@5 under /opt/homebrew; Intel Homebrew under /usr/local)
+        cmake_prefix_paths = [
+            "/usr/local/opt/qt5/lib/cmake",
+            "/opt/homebrew/opt/qt@5/lib/cmake",
+        ]
         conda_exe = shutil.which("conda")
         if conda_exe is not None:
             conda_info = json.loads(
diff --git a/procgen/src/games/chaser.cpp b/procgen/src/games/chaser.cpp
index a6ec0c8d..b0aaa2c2 100644
--- a/procgen/src/games/chaser.cpp
+++ b/procgen/src/games/chaser.cpp
@@ -293,7 +293,7 @@ class ChaserGame : public BasicAbstractGame {
     void game_step() override {
         BasicAbstractGame::game_step();
 
-        int num_orbs = 0;
+        [[maybe_unused]] int num_orbs = 0;
         int num_enemies = 0;
 
         float default_enemy_speed = .5;
diff --git a/procgen/src/games/starpilot.cpp b/procgen/src/games/starpilot.cpp
index 9ea93e03..6b4ed8d6 100644
--- a/procgen/src/games/starpilot.cpp
+++ b/procgen/src/games/starpilot.cpp
@@ -228,7 +228,7 @@ class StarPilotGame : public BasicAbstractGame {
 
         bool can_spawn_left = options.distribution_mode != EasyMode;
 
-        for (int i = 0; t <= SHOOTER_WIN_TIME; i++) {
+        for ([[maybe_unused]] int i = 0; t <= SHOOTER_WIN_TIME; i++) {
             int group_size = 1;
             float start_weight = rand_gen.rand01() * total_prob_weight;
             float curr_weight = start_weight;