Resolve abi symbols from libruby.dylib when available

configure.ac

@@ -3011,10 +3011,13 @@ STATIC=
 			: ${LDFLAGS=""}
 			: ${LIBPATHENV=DYLD_FALLBACK_LIBRARY_PATH}
 			: ${PRELOADENV=DYLD_INSERT_LIBRARIES}
-			AS_IF([test "x$EXTSTATIC" = x], [
-                          # When building ext bundles, a mach-o bundle needs to know its loader
-                          # program to bind symbols from the ruby executable
-                          EXTDLDFLAGS="-bundle_loader '\$(BUILTRUBY)'"
+                        AS_IF([test x"$enable_shared" = xyes], [
+                            # Resolve symbols from libruby.dylib when --enable-shared
+                            EXTDLDFLAGS='$(LIBRUBYARG_SHARED)'
+                        ], [test "x$EXTSTATIC" = x], [
+                            # When building exts as bundles, a mach-o bundle needs to know its loader
+                            # program to bind symbols from the ruby executable
+                            EXTDLDFLAGS="-bundle_loader '\$(BUILTRUBY)'"
 			])
 			rb_cv_dlopen=yes],
         [aix*], [	: ${LDSHARED='$(CC)'}