Index: src/exceptions/OFException.m
==================================================================
--- src/exceptions/OFException.m
+++ src/exceptions/OFException.m
@@ -38,12 +38,14 @@
 /*
  * Define HAVE_DWARF_EXCEPTIONS if OBJC_ZEROCOST_EXCEPTIONS is defined, but
  * don't do so on 32-bit ARM, as it is defined there even if SjLj exceptions
  * are used.
  */
-#if defined(OBJC_ZEROCOST_EXCEPTIONS) && !defined(__ARMEL__)
-# define HAVE_DWARF_EXCEPTIONS
+#ifndef HAVE_DWARF_EXCEPTIONS
+# if defined(OBJC_ZEROCOST_EXCEPTIONS) && !defined(__ARMEL__)
+#  define HAVE_DWARF_EXCEPTIONS
+# endif
 #endif
 
 #ifdef HAVE_DWARF_EXCEPTIONS
 struct _Unwind_Context;
 typedef enum {