Initial patch from Will.

src/platform/pam_offline/SConstruct

Index: src/platform/pam_offline/SConstruct
diff --git a/src/platform/pam_offline/SConstruct b/src/platform/pam_offline/SConstruct
index 9b14f73fc587cd428b74c2d1a5a5954dc16412a6..8265d80db8f2d1af6f229b499a3418413e714f43 100644
--- a/src/platform/pam_offline/SConstruct
+++ b/src/platform/pam_offline/SConstruct
@@ -9,18 +9,16 @@ import os
 env = Environment()
 
 pam_sources = env.Split("""utils.cc
-                        pam_prompt_wrapper.cc
-  	                credentials.cc
                         username_password.cc
                         username_password_fetcher.cc
-                        authenticator.cc
+                        credentials.cc
+                        pam_prompt_wrapper.cc
                         pam_offline.cc""")
 
 test_sources = env.Split("""pam_offline_testrunner.cc
                          username_password_unittest.cc
                          pam_prompt_wrapper_unittest.cc
                          username_password_fetcher_unittest.cc
-                         authenticator_unittest.cc
                          pam_offline_unittest.cc
                          """)
 
@@ -28,8 +26,11 @@ env.Append(
     CPPPATH=['..'],
     CCFLAGS=['-g'],
     LINKFLAGS=['-fPIC'],
-    LIBS=['pam', 'ssl', 'base', 'rt', 'pthread', 'chromeos'],
+    LIBS=['pam', 'ssl', 'base', 'rt', 'pthread', 'chromeos', 'crosapi'],
 )
+
+env.ParseConfig('pkg-config --cflags --libs dbus-glib-1')
+
 for key in Split('CC CXX AR RANLIB LD NM CFLAGS CCFLAGS'):
   value = os.environ.get(key)
   if value != None: