--- ./shell.c.org	2006-05-17 21:46:54.000000000 +0900
+++ ./shell.c	2014-09-30 22:48:03.000000000 +0900
@@ -207,6 +207,7 @@
 #else
 int posixly_correct = 0;	/* Non-zero means posix.2 superset. */
 #endif
+int import_functions = 0;      /* Import functions from environment */
 
 
 /* Some long-winded argument names.  These are obviously new. */
@@ -227,6 +228,7 @@
   { "help", Int, &want_initial_help, (char **)0x0 },
   { "init-file", Charp, (int *)0x0, &bashrc_file },
   { "login", Int, &make_login_shell, (char **)0x0 },
+  { "import-functions", Int, &import_functions, (char **)0x0 },
   { "noediting", Int, &no_line_editing, (char **)0x0 },
   { "noprofile", Int, &no_profile, (char **)0x0 },
   { "norc", Int, &no_rc, (char **)0x0 },
--- ./variables.c.org	2014-09-30 21:00:28.000000000 +0900
+++ ./variables.c	2014-09-30 22:50:34.000000000 +0900
@@ -97,6 +97,7 @@
 extern char *this_command_name;
 extern char *command_execution_string;
 extern time_t shell_start_time;
+extern int import_functions;
 
 #if defined (READLINE)
 extern int no_line_editing;
@@ -314,7 +315,7 @@
 
       /* If exported function, define it now.  Don't import functions from
 	 the environment in privileged mode. */
-      if (privmode == 0 && read_but_dont_execute == 0 &&
+      if (import_functions && privmode == 0 && read_but_dont_execute == 0 &&
 	  STREQN (BASHFUNC_PREFIX, name, BASHFUNC_PREFLEN) &&
 	  STREQ (BASHFUNC_SUFFIX, name + char_index - BASHFUNC_SUFFLEN) &&
 	  STREQN ("() {", string, 4))