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diff --git a/libguile/feature.c b/libguile/feature.c
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+/* Copyright 1995-1996,1998-2004,2006-2007,2009,2011,2013,2018
+ Free Software Foundation, Inc.
+
+ This file is part of Guile.
+
+ Guile is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Guile is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with Guile. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <string.h>
+
+#include "fluids.h"
+#include "gsubr.h"
+#include "modules.h"
+#include "pairs.h"
+#include "strings.h"
+#include "symbols.h"
+#include "variable.h"
+
+#include "feature.h"
+
+
+
+
+SCM scm_program_arguments_fluid;
+
+static SCM features_var;
+
+void
+scm_add_feature (const char *str)
+{
+ SCM old = SCM_VARIABLE_REF (features_var);
+ SCM new = scm_cons (scm_from_utf8_symbol (str), old);
+ SCM_VARIABLE_SET (features_var, new);
+}
+
+
+
+SCM_DEFINE (scm_program_arguments, "program-arguments", 0, 0, 0,
+ (),
+ "@deffnx {Scheme Procedure} command-line\n"
+ "Return the list of command line arguments passed to Guile, as a list of\n"
+ "strings. The list includes the invoked program name, which is usually\n"
+ "@code{\"guile\"}, but excludes switches and parameters for command line\n"
+ "options like @code{-e} and @code{-l}.")
+#define FUNC_NAME s_scm_program_arguments
+{
+ return scm_fluid_ref (scm_program_arguments_fluid);
+}
+#undef FUNC_NAME
+
+/* Set the value returned by program-arguments, given ARGC and ARGV.
+
+ If FIRST is non-zero, make it the first element; we do this in
+ situations where other code (like getopt) has parsed out a few
+ arguments, but we still want the script name to be the first
+ element. */
+void
+scm_set_program_arguments (int argc, char **argv, char *first)
+{
+ SCM args = scm_makfromstrs (argc, argv);
+ if (first)
+ args = scm_cons (scm_from_locale_string (first), args);
+ scm_fluid_set_x (scm_program_arguments_fluid, args);
+}
+
+SCM_DEFINE (scm_set_program_arguments_scm, "set-program-arguments", 1, 0, 0,
+ (SCM lst),
+ "Set the command line arguments to be returned by\n"
+ "@code{program-arguments} (and @code{command-line}). @var{lst}\n"
+ "should be a list of strings, the first of which is the program\n"
+ "name (either a script name, or just @code{\"guile\"}).\n"
+ "\n"
+ "Program arguments are held in a fluid and therefore have a\n"
+ "separate value in each Guile thread. Neither the list nor the\n"
+ "strings within it are copied, so should not be modified later.")
+#define FUNC_NAME s_scm_set_program_arguments_scm
+{
+ return scm_fluid_set_x (scm_program_arguments_fluid, lst);
+}
+#undef FUNC_NAME
+
+
+
+
+void
+scm_init_feature()
+{
+ scm_program_arguments_fluid = scm_make_fluid ();
+
+ features_var = scm_c_define ("*features*", SCM_EOL);
+#ifndef _Windows
+ scm_add_feature("system");
+#endif
+#ifndef GO32
+ scm_add_feature("char-ready?");
+#endif
+#if SCM_USE_PTHREAD_THREADS
+ scm_add_feature ("threads");
+#endif
+
+#include "feature.x"
+}