Index: tools/gyp/v8.gyp
--- tools/gyp/v8.gyp.orig
+++ tools/gyp/v8.gyp
@@ -82,8 +82,8 @@
                     'OTHER_LDFLAGS': ['-dynamiclib', '-all_load']
                   },
                 }],
-                ['soname_version!=""', {
-                  'product_extension': 'so.<(soname_version)',
+                ['soname_version!="-1"', {
+                  'product_extension': 'so.${LIBv8_VERSION}',
                 }],
               ],
             },