diff --git a/conanfile.py b/conanfile.py
index 0c5ef0f..5e18c81 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -54,7 +54,7 @@ def _min_cppstd(self):
     def _compilers_minimum_version(self):
         # We may reduce these in the future.
         return {
-            "gcc": ("14", "GCC 14+ required for async_context"),
+            "gcc": ("15", "GCC 15+ required for async_context"),
             "clang": (
                 "19",
                 "Clang 19+ required for async_context"
@@ -100,7 +100,7 @@ def validate(self):
     def build_requirements(self):
         self.tool_requires("cmake/[^4.0.0]")
         self.tool_requires("ninja/[^1.3.0]")
-        self.requires("libhal-cmake-util/[^5.0.3]")
+        self.requires("libhal-cmake-util/[^5.0.6]")
         if str(self.settings.os) != "baremetal":
             self.test_requires("boost-ext-ut/2.3.1",
                                options={'disable_module': False})
diff --git a/cspell.json b/cspell.json
index 11b0a86..6a42ffa 100644
--- a/cspell.json
+++ b/cspell.json
@@ -52,7 +52,8 @@
     "doxygenenum",
     "alignof",
     "inplace",
-    "interruptible"
+    "interruptible",
+    "riscv"
   ],
   "ignorePaths": [
     "build/",
diff --git a/modules/coroutine.cppm b/modules/coroutine.cppm
index 0424323..3d96666 100644
--- a/modules/coroutine.cppm
+++ b/modules/coroutine.cppm
@@ -1622,7 +1622,7 @@ public:
     requires std::is_constructible_v<T, U&&>
   {
     m_state.template emplace<T>(std::forward<U>(p_value));
-  };
+  }
 
   /**
    * @brief Move constructor for future
diff --git a/modules/sync.cppm b/modules/sync.cppm
index ce2dee4..82343fd 100644
--- a/modules/sync.cppm
+++ b/modules/sync.cppm
@@ -18,6 +18,8 @@ module;
 #include <cstddef>
 
 #include <coroutine>
+#include <new>
+#include <utility>
 
 export module async_context:sync;
 
@@ -154,7 +156,6 @@ public:
 
   private:
     friend class mutex;
-
     guard(mutex* p_access, context* p_context)
       : m_access(p_access)
       , m_context(p_context)
diff --git a/test_package/main.cpp b/test_package/main.cpp
index a7cdfbf..ece013c 100644
--- a/test_package/main.cpp
+++ b/test_package/main.cpp
@@ -29,22 +29,35 @@ import async_context;
 
 using namespace std::chrono_literals;
 
+// linking println doesn't work on embedded systems generally
+template<typename... Args>
+void test_package_print([[maybe_unused]] std::format_string<Args...> p_fmt,
+                        [[maybe_unused]] Args&&... p_args)
+{
+  // If we are on a system with a real OS (Linux, Windows, macOS), use println.
+  // If we are in an embedded toolchain (arm-none-eabi, riscv64-unknown-elf),
+  // the following macro will NOT be defined.
+#if defined(__GLIBC__) || defined(_WIN32) || defined(__APPLE__)
+  std::println(stdout, p_fmt, p_args...);
+#endif
+}
+
 // Simulates reading sensor data with I/O delay
-async::future<int> read_sensor(async::context& ctx, std::string_view p_name)
+async::future<int> read_sensor(async::context&, std::string_view p_name)
 {
-  std::println("['{}': Sensor] Read complete: 42", p_name);
+  test_package_print("['{}': Sensor] Read complete: 42", p_name);
   co_return 42;
 }
 
 // Processes data with computation delay
-async::future<int> process_data(async::context& p_ctx,
+async::future<int> process_data(async::context&,
                                 std::string_view p_name,
                                 int value)
 {
-  std::println("['{}': Process] Processing {}...", p_name, value);
+  test_package_print("['{}': Process] Processing {}...", p_name, value);
   co_await 10ms;  // Simulate processing time
   int result = value * 2;
-  std::println("['{}': Process] Result: {}", p_name, result);
+  test_package_print("['{}': Process] Result: {}", p_name, result);
   co_return result;
 }
 
@@ -52,22 +65,22 @@ async::future<void> write_actuator(async::context& p_ctx,
                                    std::string_view p_name,
                                    int value)
 {
-  std::println("['{}': Actuator] Writing {}...", p_name, value);
+  test_package_print("['{}': Actuator] Writing {}...", p_name, value);
   co_await p_ctx.block_by_signal();
-  std::println("['{}': Actuator] Write complete!", p_name);
+  test_package_print("['{}': Actuator] Write complete!", p_name);
 }
 
 // Coordinates the full pipeline
 async::future<void> sensor_pipeline(async::context& ctx,
                                     std::string_view p_name)
 {
-  std::println("Pipeline '{}' starting...", p_name);
+  test_package_print("Pipeline '{}' starting...", p_name);
 
   int sensor_value = co_await read_sensor(ctx, p_name);
   int processed = co_await process_data(ctx, p_name, sensor_value);
   co_await write_actuator(ctx, p_name, processed);
 
-  std::println("Pipeline '{}' complete!\n", p_name);
+  test_package_print("Pipeline '{}' complete!\n", p_name);
 }
 
 // Stub implementation for ARM M Cortex targets without
@@ -103,8 +116,8 @@ int main()
   auto pipeline2_future = sensor_pipeline(ctx1, "🔥 System 2");
   // This is needed to simulate the context being unblocked by an external
   // callback.
-  auto unblock_function =
-    [&ctx0, &ctx1](async::context& p_ctx) -> async::future<void> {
+  auto unblock_function = [&ctx0,
+                           &ctx1](async::context&) -> async::future<void> {
     while (true) {
       if (ctx0.done() and ctx1.done()) {
         break;
@@ -132,6 +145,6 @@ int main()
   // Run ctx0, ctx1 and unblock_context to completion
   async::run_until_done(clk, stub_sleep_function, ctx0, ctx1, unblock_context);
 
-  std::println("Both pipelines completed successfully!");
+  test_package_print("Both pipelines completed successfully!");
   return 0;
 }
diff --git a/tests/mutex.test.cpp b/tests/mutex.test.cpp
index f98af67..b0171a2 100644
--- a/tests/mutex.test.cpp
+++ b/tests/mutex.test.cpp
@@ -43,7 +43,7 @@ void guards_tests()
     auto guard = co_await mutex.lock(p_context);
 
     // setup dma transaction...
-    std::println("Waiting on io complete flag, blocking by I/O");
+    std::println("Waiting on io complete flag, blocking by signal");
 
     // Would normally wrap this in a while loop to check if the resource is
     // fread.