--- ./shell.c.org	2002-07-02 00:27:11.000000000 +0900
+++ ./shell.c	2014-09-30 23:20:58.000000000 +0900
@@ -193,6 +193,7 @@
 static int want_initial_help;		/* --help option */
 
 int no_line_editing = 0;	/* Don't do fancy line editing. */
+int import_functions = 0;	/* Import functions from environment */
 int posixly_correct = 0;	/* Non-zero means posix.2 superset. */
 int dump_translatable_strings;	/* Dump strings in $"...", don't execute. */
 int dump_po_strings;		/* Dump strings in $"..." in po format */
@@ -213,6 +214,7 @@
   { "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 23:20:17.000000000 +0900
+++ ./variables.c	2014-09-30 23:21:04.000000000 +0900
@@ -87,6 +87,7 @@
 extern SHELL_VAR *this_shell_function;
 extern char *this_command_name;
 extern time_t shell_start_time;
+extern int import_functions;
 
 /* The list of shell variables that the user has created at the global
    scope, or that came from the environment. */
@@ -265,7 +266,7 @@
 
       /* 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))