diff --git a/CMakeLists.txt b/CMakeLists.txt
index 09204a08..ea560ead 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,7 +12,7 @@ option(MI_XMALLOC           "Enable abort() call on memory allocation failure by
 option(MI_SHOW_ERRORS       "Show error and warning messages by default (only enabled by default in DEBUG mode)" OFF)
 option(MI_USE_CXX           "Use the C++ compiler to compile the library (instead of the C compiler)" OFF)
 option(MI_SEE_ASM           "Generate assembly files" OFF)
-option(MI_INTERPOSE         "Use interpose to override standard malloc on macOS" OFF)
+option(MI_OSX_INTERPOSE     "Use interpose to override standard malloc on macOS" OFF)
 option(MI_OSX_ZONE          "Use malloc zone to override standard malloc on macOS" ON) 
 option(MI_LOCAL_DYNAMIC_TLS "Use slightly slower, dlopen-compatible TLS mechanism (Unix)" OFF)
 option(MI_BUILD_SHARED      "Build shared library" ON)
@@ -23,6 +23,7 @@ option(MI_DEBUG_TSAN        "Build with thread sanitizer (needs clang)" OFF)
 option(MI_DEBUG_UBSAN       "Build with undefined-behavior sanitizer (needs clang++)" OFF)
 option(MI_CHECK_FULL        "Use full internal invariant checking in DEBUG mode (deprecated, use MI_DEBUG_FULL instead)" OFF)
 option(MI_INSTALL_TOPLEVEL  "Install directly into $CMAKE_INSTALL_PREFIX instead of PREFIX/lib/mimalloc-version" OFF)
+option(MI_USE_LIBATOMIC     "Explicitly link with -latomic (on older systems)" OFF)
 
 include("cmake/mimalloc-config-version.cmake")
 
@@ -78,11 +79,11 @@ if(MI_OVERRIDE)
       list(APPEND mi_sources src/alloc-override-osx.c)
       list(APPEND mi_defines MI_OSX_ZONE=1)      
     endif()
-    if(MI_INTERPOSE)
+    if(MI_OSX_INTERPOSE)
       # use interpose on macOS
-      message(STATUS "  Use interpose to override malloc (MI_INTERPOSE=ON)")
+      message(STATUS "  Use interpose to override malloc (MI_OSX_INTERPOSE=ON)")
       message(STATUS "  WARNING: interpose does not seem to work reliably on the M1; use -DMI_OSX_ZONE=ON instead")
-      list(APPEND mi_defines MI_INTERPOSE)
+      list(APPEND mi_defines MI_OSX_INTERPOSE)
     endif()
   endif()
 endif()
@@ -203,6 +204,10 @@ else()
   endif()
 endif()
 
+if (MI_USE_LIBATOMIC) 
+  list(APPEND mi_libraries atomic)
+endif()
+
 # -----------------------------------------------------------------------------
 # Install and output names
 # -----------------------------------------------------------------------------
diff --git a/src/alloc-override-osx.c b/src/alloc-override-osx.c
index f506d30a..a2e341bb 100644
--- a/src/alloc-override-osx.c
+++ b/src/alloc-override-osx.c
@@ -229,7 +229,7 @@ static malloc_zone_t mi_malloc_zone = {
 };
 
 
-#if defined(MI_SHARED_LIB_EXPORT) && defined(MI_INTERPOSE)
+#if defined(MI_SHARED_LIB_EXPORT) && defined(MI_OSX_INTERPOSE)
 
 static malloc_zone_t *mi_malloc_default_zone(void) {
   return &mi_malloc_zone;
diff --git a/src/alloc-override.c b/src/alloc-override.c
index 6a87e7bd..f97b6e78 100644
--- a/src/alloc-override.c
+++ b/src/alloc-override.c
@@ -13,7 +13,7 @@ terms of the MIT license. A copy of the license can be found in the file
 #error "It is only possible to override "malloc" on Windows when building as a DLL (and linking the C runtime as a DLL)"
 #endif
 
-#if defined(MI_MALLOC_OVERRIDE) && !(defined(_WIN32)) // || (defined(__APPLE__) && !defined(MI_INTERPOSE)))
+#if defined(MI_MALLOC_OVERRIDE) && !(defined(_WIN32)) // || (defined(__APPLE__) && !defined(MI_OSX_INTERPOSE)))
 
 // ------------------------------------------------------
 // Override system malloc
@@ -40,7 +40,7 @@ terms of the MIT license. A copy of the license can be found in the file
   #define MI_FORWARD02(fun,x,y)   { fun(x,y); }
 #endif
 
-#if defined(__APPLE__) && defined(MI_SHARED_LIB_EXPORT) && defined(MI_INTERPOSE)
+#if defined(__APPLE__) && defined(MI_SHARED_LIB_EXPORT) && defined(MI_OSX_INTERPOSE)
   // use interposing so `DYLD_INSERT_LIBRARIES` works without `DYLD_FORCE_FLAT_NAMESPACE=1`
   // See: <https://books.google.com/books?id=K8vUkpOXhN4C&pg=PA73>
   struct mi_interpose_s {
diff --git a/test/test-api.c b/test/test-api.c
index f72cfaf5..8ddbf7cf 100644
--- a/test/test-api.c
+++ b/test/test-api.c
@@ -4,7 +4,9 @@ This is free software; you can redistribute it and/or modify it under the
 terms of the MIT license. A copy of the license can be found in the file
 "LICENSE" at the root of this distribution.
 -----------------------------------------------------------------------------*/
+#if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC diagnostic ignored "-Walloc-size-larger-than="
+#endif
 
 /*
 Testing allocators is difficult as bugs may only surface after particular