diff --git a/src/xenia/base/profiling.cc b/src/xenia/base/profiling.cc
index 96f2ff4b4..b078e18a9 100644
--- a/src/xenia/base/profiling.cc
+++ b/src/xenia/base/profiling.cc
@@ -272,8 +272,6 @@ void Profiler::Present() {}
 
 }  // namespace xe
 
-#if XE_OPTION_PROFILING
-
 uint32_t MicroProfileGpuInsertTimeStamp() { return 0; }
 
 uint64_t MicroProfileGpuGetTimeStamp(uint32_t nKey) { return 0; }
@@ -282,6 +280,7 @@ uint64_t MicroProfileTicksPerSecondGpu() { return 0; }
 
 const char* MicroProfileGetThreadName() { return "TODO: get thread name!"; }
 
+#if XE_OPTION_PROFILING
 #if XE_OPTION_PROFILING_UI
 
 void MicroProfileDrawBox(int nX, int nY, int nX1, int nY1, uint32_t nColor,
diff --git a/src/xenia/base/threading.cc b/src/xenia/base/threading.cc
index 40d89a6c0..98c91715e 100644
--- a/src/xenia/base/threading.cc
+++ b/src/xenia/base/threading.cc
@@ -12,6 +12,14 @@
 namespace xe {
 namespace threading {
 
+uint32_t logical_processor_count() {
+  static uint32_t value = 0;
+  if (!value) {
+    value = std::thread::hardware_concurrency();
+  }
+  return value;
+}
+
 thread_local uint32_t current_thread_id_ = UINT_MAX;
 
 uint32_t current_thread_id() {
diff --git a/src/xenia/base/threading_win.cc b/src/xenia/base/threading_win.cc
index d36ee76e1..4381db8cb 100644
--- a/src/xenia/base/threading_win.cc
+++ b/src/xenia/base/threading_win.cc
@@ -16,16 +16,6 @@
 namespace xe {
 namespace threading {
 
-uint32_t logical_processor_count() {
-  static uint32_t value = 0;
-  if (!value) {
-    SYSTEM_INFO system_info;
-    GetSystemInfo(&system_info);
-    value = system_info.dwNumberOfProcessors;
-  }
-  return value;
-}
-
 void EnableAffinityConfiguration() {
   HANDLE process_handle = GetCurrentProcess();
   DWORD_PTR process_affinity_mask;
diff --git a/src/xenia/cpu/backend/x64/x64_emitter.cc b/src/xenia/cpu/backend/x64/x64_emitter.cc
index 0feb06471..79f7f1cbd 100644
--- a/src/xenia/cpu/backend/x64/x64_emitter.cc
+++ b/src/xenia/cpu/backend/x64/x64_emitter.cc
@@ -11,6 +11,7 @@
 
 #include <gflags/gflags.h>
 
+#include <climits>
 #include <cstring>
 
 #include "xenia/base/assert.h"
diff --git a/src/xenia/cpu/hir/value.cc b/src/xenia/cpu/hir/value.cc
index 4d30de853..0c6f62f55 100644
--- a/src/xenia/cpu/hir/value.cc
+++ b/src/xenia/cpu/hir/value.cc
@@ -251,6 +251,9 @@ void Value::Round(RoundMode round_mode) {
         case ROUND_TO_NEAREST:
           constant.f32 = std::round(constant.f32);
           return;
+        default:
+          assert_unhandled_case(round_mode);
+          return;
       }
       return;
     case FLOAT64_TYPE:
@@ -261,11 +264,15 @@ void Value::Round(RoundMode round_mode) {
           case ROUND_TO_NEAREST:
             constant.v128.f32[i] = std::round(constant.v128.f32[i]);
             return;
+          default:
+            assert_unhandled_case(round_mode);
+            return;
         }
       }
       return;
     default:
       assert_unhandled_case(type);
+      return;
   }
 }
 
@@ -791,6 +798,9 @@ void Value::Extract(Value* vec, Value* index) {
     case INT64_TYPE:
       constant.u64 = vec->constant.v128.u64[index->constant.u64];
       break;
+    default:
+      assert_unhandled_case(type);
+      break;
   }
 }
 
@@ -1013,6 +1023,9 @@ void Value::VectorSub(Value* other, TypeName type, bool is_unsigned,
           }
         }
       }
+    default:
+      assert_unhandled_case(type);
+      break;
   }
 }
 
diff --git a/src/xenia/cpu/testing/vector_max_test.cc b/src/xenia/cpu/testing/vector_max_test.cc
index 3b4bcd66c..eba85a653 100644
--- a/src/xenia/cpu/testing/vector_max_test.cc
+++ b/src/xenia/cpu/testing/vector_max_test.cc
@@ -10,6 +10,7 @@
 #include "xenia/cpu/testing/util.h"
 
 #include <cfloat>
+#include <climits>
 
 using namespace xe;
 using namespace xe::cpu;
diff --git a/src/xenia/cpu/testing/vector_min_test.cc b/src/xenia/cpu/testing/vector_min_test.cc
index 3d2b77190..6d54c3ef7 100644
--- a/src/xenia/cpu/testing/vector_min_test.cc
+++ b/src/xenia/cpu/testing/vector_min_test.cc
@@ -10,6 +10,7 @@
 #include "xenia/cpu/testing/util.h"
 
 #include <cfloat>
+#include <climits>
 
 using namespace xe;
 using namespace xe::cpu;
diff --git a/src/xenia/gpu/gl4/gl4_shader.h b/src/xenia/gpu/gl4/gl4_shader.h
index 96a62f718..91b1e6098 100644
--- a/src/xenia/gpu/gl4/gl4_shader.h
+++ b/src/xenia/gpu/gl4/gl4_shader.h
@@ -29,7 +29,7 @@ class GL4Shader : public Shader {
   GLuint shader() const { return shader_; }
   GLuint vao() const { return vao_; }
 
-  bool Prepare();
+  bool Prepare() override;
 
  protected:
   bool PrepareVertexArrayObject();
diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_rtl.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_rtl.cc
index c019d3394..2ee1412ad 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_rtl.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_rtl.cc
@@ -25,8 +25,10 @@
 #include "xenia/kernel/xevent.h"
 #include "xenia/kernel/xthread.h"
 
-// For FileTimeToSystemTime and SystemTimeToFileTime:
+#if XE_PLATFORM_WIN32
 #include "xenia/base/platform_win.h"
+#define timegm _mkgmtime
+#endif
 
 namespace xe {
 namespace kernel {
@@ -439,44 +441,41 @@ struct X_TIME_FIELDS {
 };
 static_assert(sizeof(X_TIME_FIELDS) == 16, "Must be LARGEINTEGER");
 
+// https://support.microsoft.com/en-us/kb/167296
 void RtlTimeToTimeFields(lpqword_t time_ptr,
                          pointer_t<X_TIME_FIELDS> time_fields_ptr) {
-  // TODO(benvanik): replace with our own version.
-  FILETIME ft;
-  ft.dwHighDateTime = static_cast<uint32_t>(time_ptr.value() >> 32);
-  ft.dwLowDateTime = static_cast<uint32_t>(time_ptr.value());
-  SYSTEMTIME st;
-  FileTimeToSystemTime(&ft, &st);
+  int64_t time_ms = time_ptr.value() / 10000 - 11644473600000LL;
+  time_t timet = time_ms / 1000;
+  struct tm* tm = gmtime(&timet);
 
-  time_fields_ptr->year = st.wYear;
-  time_fields_ptr->month = st.wMonth;
-  time_fields_ptr->day = st.wDay;
-  time_fields_ptr->hour = st.wHour;
-  time_fields_ptr->minute = st.wMinute;
-  time_fields_ptr->second = st.wSecond;
-  time_fields_ptr->milliseconds = st.wMilliseconds;
-  time_fields_ptr->weekday = st.wDayOfWeek;
+  time_fields_ptr->year = tm->tm_year + 1900;
+  time_fields_ptr->month = tm->tm_mon + 1;
+  time_fields_ptr->day = tm->tm_mday;
+  time_fields_ptr->hour = tm->tm_hour;
+  time_fields_ptr->minute = tm->tm_min;
+  time_fields_ptr->second = tm->tm_sec;
+  time_fields_ptr->milliseconds = time_ms % 1000;
+  time_fields_ptr->weekday = tm->tm_wday;
 }
 DECLARE_XBOXKRNL_EXPORT(RtlTimeToTimeFields, ExportTag::kImplemented);
 
 dword_result_t RtlTimeFieldsToTime(pointer_t<X_TIME_FIELDS> time_fields_ptr,
                                    lpqword_t time_ptr) {
-  // TODO(benvanik): replace with our own version.
-  SYSTEMTIME st;
-  st.wYear = time_fields_ptr->year;
-  st.wMonth = time_fields_ptr->month;
-  st.wDay = time_fields_ptr->day;
-  st.wHour = time_fields_ptr->hour;
-  st.wMinute = time_fields_ptr->minute;
-  st.wSecond = time_fields_ptr->second;
-  st.wMilliseconds = time_fields_ptr->milliseconds;
-  st.wDayOfWeek = time_fields_ptr->weekday;
-  FILETIME ft;
-  if (!SystemTimeToFileTime(&st, &ft)) {
+  struct tm tm;
+  tm.tm_year = time_fields_ptr->year - 1900;
+  tm.tm_mon = time_fields_ptr->month - 1;
+  tm.tm_mday = time_fields_ptr->day;
+  tm.tm_hour = time_fields_ptr->hour;
+  tm.tm_min = time_fields_ptr->minute;
+  tm.tm_sec = time_fields_ptr->second;
+  tm.tm_isdst = 0;
+  time_t timet = timegm(&tm);
+  if (timet == -1) {
     // set last error = ERROR_INVALID_PARAMETER
     return 0;
   }
-  uint64_t time = (uint64_t(ft.dwHighDateTime) << 32) | ft.dwLowDateTime;
+  uint64_t time =
+      ((timet + 11644473600LL) * 1000 + time_fields_ptr->milliseconds) * 10000;
   *time_ptr = time;
   return 1;
 }
diff --git a/src/xenia/kernel/xthread.cc b/src/xenia/kernel/xthread.cc
index da009c69d..81d11fa7f 100644
--- a/src/xenia/kernel/xthread.cc
+++ b/src/xenia/kernel/xthread.cc
@@ -36,6 +36,10 @@ DEFINE_bool(ignore_thread_affinities, true,
 namespace xe {
 namespace kernel {
 
+const uint32_t XAPC::kSize;
+const uint32_t XAPC::kDummyKernelRoutine;
+const uint32_t XAPC::kDummyRundownRoutine;
+
 using xe::cpu::ppc::PPCOpcode;
 
 uint32_t next_xthread_id_ = 0;
diff --git a/tools/build/scripts/build_paths.lua b/tools/build/scripts/build_paths.lua
index 2e5231844..5fcceb061 100644
--- a/tools/build/scripts/build_paths.lua
+++ b/tools/build/scripts/build_paths.lua
@@ -7,4 +7,8 @@ build_tools = "tools/build"
 build_scripts = build_tools .. "/scripts"
 build_tools_src = build_tools .. "/src"
 
-platform_suffix = "win"
+if os.is("windows") then
+  platform_suffix = "win"
+else
+  platform_suffix = "posix"
+end