diff --git a/make-3.82-gbuild/function.c b/make-3.82-gbuild/function.c

index e2f6c8c..ff0527f 100644

--- a/make-3.82/function.c

+++ b/make-3.82/function.c

@@ -2333,8 +2333,10 @@ func_call (char *o, char **argv, const char *funcname UNUSED)

   v = lookup_variable (fname, flen);

   if (v == 0)

-    warn_undefined (fname, flen);

-

+    {

+      warn_undefined (fname, flen);

+      warn_undefined_function (fname, flen);

+    }

   if (v == 0 || *v->value == '\0')

     return o;

diff --git a/make-3.82-gbuild/main.c b/make-3.82-gbuild/main.c

index c6989e3..2f545a7 100644

--- a/make-3.82/main.c

+++ b/make-3.82/main.c

@@ -275,6 +275,11 @@ static int print_usage_flag = 0;

 int warn_undefined_variables_flag;

+/* If nonzero, we should print a warning message

+   for each attemtp to call an undefined user function.  */

+

+int warn_undefined_functions_flag;

+

 /* If nonzero, always build all targets, regardless of whether

    they appear out of date or not.  */

@@ -368,6 +373,8 @@ static const char *const usage[] =

                               Consider FILE to be infinitely new.\n"),

     N_("\

   --warn-undefined-variables  Warn when an undefined variable is referenced.\n"),

+    N_("\

+  --warn-undefined-functions  Warn when an undefined user function is called.\n"),

     NULL

   };

@@ -424,6 +431,8 @@ static const struct command_switch switches[] =

     { CHAR_MAX+5, flag, &warn_undefined_variables_flag, 1, 1, 0, 0, 0,

       "warn-undefined-variables" },

     { CHAR_MAX+6, string, &eval_strings, 1, 0, 0, 0, 0, "eval" },

+    { CHAR_MAX+7, flag, &warn_undefined_functions_flag, 1, 1, 0, 0, 0,

+      "warn-undefined-functions" },

     { 0, 0, 0, 0, 0, 0, 0, 0, 0 }

   };

diff --git a/make-3.82-gbuild/make.h b/make-3.82-gbuild/make.h

index 60ade4c..f2ebb56 100644

--- a/make-3.82/make.h

+++ b/make-3.82/make.h

@@ -513,7 +513,7 @@ extern int env_overrides, no_builtin_rules_flag, no_builtin_variables_flag;

 extern int print_version_flag, print_directory_flag, check_symlink_flag;

 extern int warn_undefined_variables_flag, posix_pedantic, not_parallel;

 extern int second_expansion, clock_skew_detected, rebuilding_makefiles;

-extern int one_shell;

+extern int one_shell, warn_undefined_functions_flag;

 /* can we run commands via 'sh -c xxx' or must we use batch files? */

 extern int batch_mode_shell;

diff --git a/make-3.82-gbuild/variable.h b/make-3.82-gbuild/variable.h

index c215867..02713c1 100644

--- a/make-3.82/variable.h

+++ b/make-3.82/variable.h

@@ -220,6 +220,13 @@ void undefine_variable_in_set (const char *name, unsigned int length,

                                 (int)(l), (n)); \

                               }while(0)

+#define warn_undefined_function(n,l) do{\

+                              if (warn_undefined_functions_flag) \

+                                error (reading_file, \

+                                       _("warning: undefined function `%.*s'"), \

+                                (int)(l), (n)); \

+                              }while(0)

+

 char **target_environment (struct file *file);

 struct pattern_var *create_pattern_var (const char *target,

--

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