--- ./shell.c.org	2009-11-20 00:05:54.000000000 +0900
+++ ./shell.c	2014-10-01 12:41:15.000000000 +0900
@@ -225,6 +225,7 @@
 #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. */
@@ -245,6 +246,7 @@
   { "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	2014-10-01 12:41:15.000000000 +0900
+++ ./variables.c	2014-10-01 12:41:15.000000000 +0900
@@ -102,6 +102,7 @@
 extern char *this_command_name;
 extern char *command_execution_string;
 extern time_t shell_start_time;
+extern int import_functions;
 extern int assigning_in_environment;
 extern int executing_builtin;
 
@@ -343,7 +344,7 @@
 
       /* 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))