patch 7.4.907
Problem:    Libraries for dynamically loading interfaces can only be defined
            at compile time.
Solution:   Add options to specify the dll names. (Kazuki Sakamoto,
            closes #452)
diff --git a/src/if_perl.xs b/src/if_perl.xs
index 685c0ba..19292b3 100644
--- a/src/if_perl.xs
+++ b/src/if_perl.xs
@@ -611,7 +611,12 @@
 perl_enabled(verbose)
     int		verbose;
 {
-    return perl_runtime_link_init(DYNAMIC_PERL_DLL, verbose) == OK;
+#if WIN3264
+    char *dll = DYNAMIC_PERL_DLL;
+#else
+    char *dll = *p_perldll ? (char *)p_perldll : DYNAMIC_PERL_DLL;
+#endif
+    return perl_runtime_link_init(dll, verbose) == OK;
 }
 #endif /* DYNAMIC_PERL */