Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -763,10 +763,16 @@
 		    -o x"$enable_shared" = x"no"], [
 			AC_SUBST(OBJFW_BRIDGE_STATIC_LIB, "libobjfw-bridge.a")
 		])
 	])
 ])
+
+case "$host" in
+	arm-apple-darwin*)
+		AC_DEFINE(OF_IOS, 1, [Whether we compile for iOS])
+		;;
+esac
 
 AS_IF([test x"$GOBJC" = x"yes"], [
 	OBJCFLAGS="$OBJCFLAGS -Wwrite-strings -Wpointer-arith -Werror"
 
 	AC_MSG_CHECKING(whether we have gcc bug objc/27438)

Index: src/macros.h
==================================================================
--- src/macros.h
+++ src/macros.h
@@ -331,18 +331,10 @@
 # define OF_BSWAP_DOUBLE_IF_BE(i) (i)
 # define OF_BSWAP_FLOAT_IF_LE(i) OF_BSWAP_FLOAT(i)
 # define OF_BSWAP_DOUBLE_IF_LE(i) OF_BSWAP_DOUBLE(i)
 #endif
 
-/*
- * We define it here and not in objfw-defs.h, as it would be theoretically
- * possible to build a universal binary for Mac OS X and iOS.
- */
-#if defined(__APPLE__) && defined(__arm__)
-# define OF_IOS
-#endif
-
 #define OF_ROL(value, bits)						   \
 	(((value) << ((bits) % (sizeof(value) * 8))) |			   \
 	((value) >> (sizeof(value) * 8 - ((bits) % (sizeof(value) * 8)))))
 #define OF_ROR(value, bits)						   \
 	(((value) >> ((bits) % (sizeof(value) * 8))) |			   \