diff --git a/CMakeLists.txt b/CMakeLists.txt
index e9f5c6f215..69cbc039b0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,6 +60,10 @@ if(APPLE)
         if (PLASMA_MAC_UNIVERSAL)
             set(CMAKE_OSX_ARCHITECTURES "$(ARCHS_STANDARD)")
         endif()
+
+        if(CMAKE_SYSTEM_VERSION VERSION_LESS 10) # Darwin 10 == Mac OS X 10.6
+            set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
+        endif()
     endif(CMAKE_SYSTEM_NAME MATCHES "Darwin")
 endif(APPLE)
 
diff --git a/Sources/Plasma/CoreLib/CMakeLists.txt b/Sources/Plasma/CoreLib/CMakeLists.txt
index e300eede33..bf6b0e1464 100644
--- a/Sources/Plasma/CoreLib/CMakeLists.txt
+++ b/Sources/Plasma/CoreLib/CMakeLists.txt
@@ -21,7 +21,7 @@ set(CoreLib_SOURCES
     plLoadMask.cpp
     plProduct.cpp
     plViewTransform.cpp
-    hsWindows.cpp
+    $<$<PLATFORM_ID:Windows>:hsWindows.cpp>
 )
 
 if(CMAKE_USE_WIN32_THREADS_INIT)
diff --git a/Sources/Plasma/CoreLib/hsWindows.cpp b/Sources/Plasma/CoreLib/hsWindows.cpp
index 5b7bfc0c28..f6274bf91b 100644
--- a/Sources/Plasma/CoreLib/hsWindows.cpp
+++ b/Sources/Plasma/CoreLib/hsWindows.cpp
@@ -40,8 +40,6 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 
 *==LICENSE==*/
 
-#ifdef HS_BUILD_FOR_WIN32
-
 #include "HeadSpin.h"
 #include "hsWindows.h"
 #include <combaseapi.h>
@@ -93,5 +91,3 @@ const RTL_OSVERSIONINFOEXW& hsGetWindowsVersion()
     }
     return s_WinVer;
 }
-
-#endif
diff --git a/Sources/Plasma/PubUtilLib/plAudio/plAudioSystem.cpp b/Sources/Plasma/PubUtilLib/plAudio/plAudioSystem.cpp
index 401001a7af..612716f878 100644
--- a/Sources/Plasma/PubUtilLib/plAudio/plAudioSystem.cpp
+++ b/Sources/Plasma/PubUtilLib/plAudio/plAudioSystem.cpp
@@ -79,6 +79,10 @@ ST::string kDefaultDeviceMagic = ST_LITERAL("(Default Device)");
 #define MAX_NUM_SOURCES 128
 #define UPDATE_TIME_MS 100
 
+#ifndef ALC_ALL_DEVICES_SPECIFIER
+#   define ALC_ALL_DEVICES_SPECIFIER 0x1013
+#endif
+
 plProfile_CreateTimer("EAX Update", "Sound", SoundEAXUpdate);
 plProfile_CreateTimer("Soft Update", "Sound", SoundSoftUpdate);
 plProfile_CreateCounter("Max Sounds", "Sound", SoundMaxNum);
diff --git a/Sources/Plasma/PubUtilLib/plUnifiedTime/plUnifiedTime.cpp b/Sources/Plasma/PubUtilLib/plUnifiedTime/plUnifiedTime.cpp
index 2935dce6da..69baa5cbae 100644
--- a/Sources/Plasma/PubUtilLib/plUnifiedTime/plUnifiedTime.cpp
+++ b/Sources/Plasma/PubUtilLib/plUnifiedTime/plUnifiedTime.cpp
@@ -43,6 +43,11 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #include <cmath>
 #include <string_theory/format>
 
+#ifdef HS_BUILD_FOR_APPLE
+#   include <AvailabilityMacros.h>
+#   include <sys/time.h>
+#endif
+
 #include "plUnifiedTime.h"
 
 #include "hsStream.h"
@@ -107,10 +112,21 @@ void plUnifiedTime::ToCurrentTime()
     struct timespec ts;
 
 #if defined(HS_BUILD_FOR_APPLE)
-    // timespec_get is only supported since macOS 10.15,
-    // but clock_gettime exists since macOS 10.12.
-    int res = clock_gettime(CLOCK_REALTIME, &ts);
-    hsAssert(res == 0, "clock_gettime failed");
+#if defined(HAVE_BUILTIN_AVAILABLE) && MAC_OS_X_VERSION_MIN_REQUIRED >= 101500
+    if (__builtin_available(macOS 10.15, *)) {
+        // timespec_get is only supported since macOS 10.15
+        int res = timespec_get(&ts, TIME_UTC);
+        hsAssert(res != 0, "timespec_get failed");
+    } else
+#endif
+    {
+        struct timeval tv;
+        int res = gettimeofday(&tv, nullptr);
+        hsAssert(res == 0, "gettimeofday failed");
+
+        ts.tv_sec = tv.tv_sec;
+        ts.tv_nsec = tv.tv_usec * 1000;
+    }
 #else
     int res = timespec_get(&ts, TIME_UTC);
     hsAssert(res != 0, "timespec_get failed");