Working compilation, but adding variant_dir = BUILD it doesn't work

src/lib/SConscript

@@ -0,0 +1,10 @@
+# Inherit global environment
+Import('env')
+Import('symbols')
+
+# The set of source files associated with this SConscript file.
+src_local = ['printk.c', 'putc.c', 'string.c', 'bit.c', 'wait.c', 'mutex.c', 'idpool.c', 'memcache.c']
+
+obj = env.Object(src_local)
+
+Return('obj')