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diff --git a/ext/fiddle/closure.c b/ext/fiddle/closure.c
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index 1a80b2b..b997e23 100644
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--- a/ext/fiddle/closure.c
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+++ b/ext/fiddle/closure.c
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@@ -13,25 +13,11 @@ typedef struct {
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     ffi_type **argv;
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 } fiddle_closure;
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-#if defined(USE_FFI_CLOSURE_ALLOC)
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-#elif defined(__OpenBSD__) || defined(__APPLE__) || defined(__linux__)
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-# define USE_FFI_CLOSURE_ALLOC 0
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-#elif defined(RUBY_LIBFFI_MODVERSION) && RUBY_LIBFFI_MODVERSION < 3000005 && \
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-	(defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_AMD64))
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-# define USE_FFI_CLOSURE_ALLOC 0
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-#else
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-# define USE_FFI_CLOSURE_ALLOC 1
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-#endif
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-
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 static void
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 dealloc(void * ptr)
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 {
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     fiddle_closure * cls = (fiddle_closure *)ptr;
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-#if USE_FFI_CLOSURE_ALLOC
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     ffi_closure_free(cls->pcl);
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-#else
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-    munmap(cls->pcl, sizeof(*cls->pcl));
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-#endif
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     if (cls->argv) xfree(cls->argv);
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     xfree(cls);
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 }
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@@ -205,12 +191,7 @@ allocate(VALUE klass)
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     VALUE i = TypedData_Make_Struct(klass, fiddle_closure,
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 	    &closure_data_type, closure);
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-#if USE_FFI_CLOSURE_ALLOC
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     closure->pcl = ffi_closure_alloc(sizeof(ffi_closure), &closure->code);
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-#else
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-    closure->pcl = mmap(NULL, sizeof(ffi_closure), PROT_READ | PROT_WRITE,
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-        MAP_ANON | MAP_PRIVATE, -1, 0);
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-#endif
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     return i;
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 }
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@@ -257,17 +238,8 @@ initialize(int rbargc, VALUE argv[], VALUE self)
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     if (FFI_OK != result)
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 	rb_raise(rb_eRuntimeError, "error prepping CIF %d", result);
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-#if USE_FFI_CLOSURE_ALLOC
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     result = ffi_prep_closure_loc(pcl, cif, callback,
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 		(void *)self, cl->code);
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-#else
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-    result = ffi_prep_closure(pcl, cif, callback, (void *)self);
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-    cl->code = (void *)pcl;
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-    i = mprotect(pcl, sizeof(*pcl), PROT_READ | PROT_EXEC);
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-    if (i) {
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-	rb_sys_fail("mprotect");
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-    }
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-#endif
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     if (FFI_OK != result)
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 	rb_raise(rb_eRuntimeError, "error prepping closure %d", result);