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diff --git a/CMakeLists.txt b/CMakeLists.txt
index b952d7bf..d555d25a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -134,7 +134,12 @@ check_c_source_compiles("
f(void) {}
int main(void) { return 0; }
" HAVE_FUNC_ATTRIBUTE_DESTRUCTOR)
-check_symbol_exists(getentropy "sys/random.h" HAVE_DECL_GETENTROPY)
+if (APPLE)
+ # In old macOS SDKs (ex: 10.15), sys/random.h fails to include header files it needs, so add them here.
+ check_symbol_exists(getentropy "Availability.h;stddef.h;sys/random.h" HAVE_GETENTROPY)
+else()
+ check_symbol_exists(getentropy sys/random.h HAVE_GETENTROPY)
+endif()
check_symbol_exists(glob "glob.h" HAVE_DECL_GLOB)
check_symbol_exists(mmap "sys/mman.h" HAVE_DECL_MMAP)
check_include_files(stdint.h HAVE_STDINT_H)
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