Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -1577,11 +1577,14 @@
 	darwin*)
 		AC_MSG_CHECKING(whether we are compiling for macOS)
 		AC_EGREP_CPP(egrep_cpp_yes, [
 			#include <TargetConditionals.h>
 
-			#if defined(TARGET_OS_OSX) && TARGET_OS_OSX
+			#if (!defined(TARGET_OS_IPHONE) || \
+			    !TARGET_OS_IPHONE) && \
+			    (!defined(TARGET_OS_SIMULATOR) || \
+			    !TARGET_OS_SIMULATOR)
 			egrep_cpp_yes
 			#endif
 		], [
 			AC_MSG_RESULT(yes)
 			have_processes="yes"

Index: src/platform.h
==================================================================
--- src/platform.h
+++ src/platform.h
@@ -103,12 +103,11 @@
 #if defined(__APPLE__)
 # include <TargetConditionals.h>
 # if (defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) || \
     (defined(TARGET_OS_SIMULATOR) && TARGET_OS_SIMULATOR)
 #  define OF_IOS
-# endif
-# if defined(TARGET_OS_OSX) && TARGET_OS_OSX
+# else
 #  define OF_MACOS
 # endif
 #elif defined(__linux__)
 # define OF_LINUX
 #elif defined(_WIN32)