diff --git a/configure.ac b/configure.ac
index 8f77138a9..089903527 100644
--- a/configure.ac
+++ b/configure.ac
@@ -492,6 +492,9 @@ AC_CHECK_FUNCS([DINFINITY DQNAN cexp chsize clog clog10 ctermid		\
   strcoll strcoll_l strtod_l strtol_l newlocale uselocale utimensat	\
   sched_getaffinity sched_setaffinity sendfile])
 
+# The newlib C library uses _NL_ prefixed locale langinfo constants.
+AC_CHECK_DECLS([_NL_NUMERIC_GROUPING], [], [], [[#include <langinfo.h>]])
+
 # Reasons for testing:
 #   netdb.h - not in mingw
 #   sys/param.h - not in mingw
diff --git a/libguile/i18n.c b/libguile/i18n.c
index 65cfbc7e9..fa7a9bda8 100644
--- a/libguile/i18n.c
+++ b/libguile/i18n.c
@@ -1,4 +1,4 @@
-/* Copyright 2006-2014,2017-2018
+/* Copyright 2006-2014,2017-2019
      Free Software Foundation, Inc.
 
    This file is part of Guile.
@@ -80,6 +80,31 @@ setlocale (int category, const char *name)
 }
 #endif
 
+/* The newlib C library has alternative names for locale constants.  */
+#if HAVE_DECL__NL_NUMERIC_GROUPING
+#define INT_CURR_SYMBOL    _NL_MONETARY_INT_CURR_SYMBOL
+#define MON_DECIMAL_POINT  _NL_MONETARY_MON_DECIMAL_POINT
+#define MON_THOUSANDS_SEP  _NL_MONETARY_MON_THOUSANDS_SEP
+#define MON_GROUPING       _NL_MONETARY_MON_GROUPING
+#define POSITIVE_SIGN      _NL_MONETARY_POSITIVE_SIGN
+#define NEGATIVE_SIGN      _NL_MONETARY_NEGATIVE_SIGN
+#define GROUPING           _NL_NUMERIC_GROUPING
+#define INT_FRAC_DIGITS    _NL_MONETARY_INT_FRAC_DIGITS
+#define FRAC_DIGITS        _NL_MONETARY_FRAC_DIGITS
+#define P_CS_PRECEDES      _NL_MONETARY_P_CS_PRECEDES
+#define P_SEP_BY_SPACE     _NL_MONETARY_P_SEP_BY_SPACE
+#define N_CS_PRECEDES      _NL_MONETARY_N_CS_PRECEDES
+#define N_SEP_BY_SPACE     _NL_MONETARY_N_SEP_BY_SPACE
+#define P_SIGN_POSN        _NL_MONETARY_P_SIGN_POSN
+#define N_SIGN_POSN        _NL_MONETARY_N_SIGN_POSN
+#define INT_P_CS_PRECEDES  _NL_MONETARY_INT_P_CS_PRECEDES
+#define INT_P_SEP_BY_SPACE _NL_MONETARY_INT_P_SEP_BY_SPACE
+#define INT_N_CS_PRECEDES  _NL_MONETARY_INT_N_CS_PRECEDES
+#define INT_N_SEP_BY_SPACE _NL_MONETARY_INT_N_SEP_BY_SPACE
+#define INT_P_SIGN_POSN    _NL_MONETARY_INT_P_SIGN_POSN
+#define INT_N_SIGN_POSN    _NL_MONETARY_INT_N_SIGN_POSN
+#endif
+
 /* Helper stringification macro.  */
 #define SCM_I18N_STRINGIFY(_name)   # _name