1 files changed, 30 insertions, 0 deletions
diff --git a/tool/fake.rb b/tool/fake.rb
new file mode 100644
index 0000000000..7d3a471402
--- /dev/null
+++ b/tool/fake.rb
@@ -0,0 +1,30 @@
+class File
+  sep = ("\\" if RUBY_PLATFORM =~ /mswin|bccwin|mingw/)
+  if sep != ALT_SEPARATOR
+    remove_const :ALT_SEPARATOR
+    ALT_SEPARATOR = sep
+  end
+end
+
+$:.unshift(builddir)
+posthook = proc do
+  mkconfig = RbConfig::MAKEFILE_CONFIG
+  extout = File.expand_path(mkconfig["EXTOUT"], builddir)
+  $arch_hdrdir = "#{extout}/include/$(arch)"
+  $ruby = baseruby
+  untrace_var(:$ruby, posthook)
+end
+prehook = proc do |extmk|
+  unless extmk
+    config = RbConfig::CONFIG
+    mkconfig = RbConfig::MAKEFILE_CONFIG
+    mkconfig["top_srcdir"] = $top_srcdir = top_srcdir
+    mkconfig["rubyhdrdir"] = "$(top_srcdir)/include"
+    mkconfig["builddir"] = config["builddir"] = builddir
+    config["rubyhdrdir"] = File.join(mkconfig["top_srcdir"], "include")
+    mkconfig["libdir"] = config["libdir"] = mkconfig["topdir"]
+    trace_var(:$ruby, posthook)
+  end
+  untrace_var(:$extmk, prehook)
+end
+trace_var(:$extmk, prehook)