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diff --git a/configure.ac b/configure.ac
index 4bb6d90..8d30a95 100644
--- a/configure.ac
+++ b/configure.ac
@@ -158,7 +158,7 @@ AC_CHECK_LIB(expat,XML_ParserCreate,[EXPAT_LIBS="-lexpat"],
 	     [AC_MSG_ERROR([Can't find expat library. Please install expat.])])
 AC_SUBST(EXPAT_LIBS)
 
-AC_CHECK_FUNCS(clearenv)
+AC_CHECK_FUNCS(clearenv getnetgrent innetgr)
 
 if test "x$GCC" = "xyes"; then
   LDFLAGS="-Wl,--as-needed $LDFLAGS"
diff --git a/src/polkitbackend/polkitbackendinteractiveauthority.c b/src/polkitbackend/polkitbackendinteractiveauthority.c
index 3bd2f0b..9d2ec61 100644
--- a/src/polkitbackend/polkitbackendinteractiveauthority.c
+++ b/src/polkitbackend/polkitbackendinteractiveauthority.c
@@ -2103,6 +2103,7 @@ get_users_in_group (PolkitIdentity                    *group,
   return ret;
 }
 
+#if defined HAVE_GETNETGRENT
 static GList *
 get_users_in_net_group (PolkitIdentity                    *group,
                         gboolean                           include_root)
@@ -2154,6 +2155,7 @@ get_users_in_net_group (PolkitIdentity                    *group,
   endnetgrent ();
   return ret;
 }
+#endif
 
 /* ---------------------------------------------------------------------------------------------------- */
 
@@ -2243,10 +2245,12 @@ authentication_agent_initiate_challenge (AuthenticationAgent         *agent,
         {
           user_identities = g_list_concat (user_identities, get_users_in_group (identity, FALSE));
         }
+#if defined HAVE_GETNETGRENT
       else if (POLKIT_IS_UNIX_NETGROUP (identity))
         {
           user_identities =  g_list_concat (user_identities, get_users_in_net_group (identity, FALSE));
         }
+#endif
       else
         {
           g_warning ("Unsupported identity");
diff --git a/src/polkitbackend/polkitbackendjsauthority.c b/src/polkitbackend/polkitbackendjsauthority.c
index bc2fe22..b84c110 100644
--- a/src/polkitbackend/polkitbackendjsauthority.c
+++ b/src/polkitbackend/polkitbackendjsauthority.c
@@ -29,6 +29,7 @@
 #include <glib/gstdio.h>
 #include <locale.h>
 #include <glib/gi18n-lib.h>
+#include <sys/wait.h>
 
 #include <polkit/polkit.h>
 #include "polkitbackendjsauthority.h"
@@ -1450,13 +1451,16 @@ js_polkit_user_is_in_netgroup (JSContext  *cx,
   JSBool ret = JS_FALSE;
   JSString *user_str;
   JSString *netgroup_str;
-  char *user;
-  char *netgroup;
   JSBool is_in_netgroup = JS_FALSE;
 
   if (!JS_ConvertArguments (cx, argc, JS_ARGV (cx, vp), "SS", &user_str, &netgroup_str))
     goto out;
 
+#if defined(HAVE_INNETGR)
+  {
+  char *user;
+  char *netgroup;
+
   user = JS_EncodeString (cx, user_str);
   netgroup = JS_EncodeString (cx, netgroup_str);
 
@@ -1470,6 +1474,8 @@ js_polkit_user_is_in_netgroup (JSContext  *cx,
 
   JS_free (cx, netgroup);
   JS_free (cx, user);
+  }
+#endif
 
   ret = JS_TRUE;