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diff --git a/test/parse_rgb.h b/test/parse_rgb.h
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+/****************************************************************************
+ * Copyright 2018,2020 Thomas E. Dickey                                     *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+/*
+ * $Id: parse_rgb.h,v 1.5 2020/02/02 23:34:34 tom Exp $
+ *
+ * Sample implementation of ncurses RGB extension from user_caps(5).
+ */
+#ifndef PARSE_RBG_H_incl
+#define PARSE_RBG_H_incl 1
+
+#include <test.priv.h>
+
+#if HAVE_TIGETSTR && USE_WIDEC_SUPPORT
+static int
+parse_rgb(int *r_max, int *g_max, int *b_max)
+{
+    int colors = tigetnum("colors");
+    int result = ERR;
+
+    *r_max = *g_max = *b_max = 0;
+
+    if (colors > 0) {
+	int max_bits;
+	int bits;
+	int pwr2;
+	int r = 0, g = 0, b = 0;
+	char *data;
+	char ch;
+
+	for (max_bits = 0, pwr2 = 1;
+	     pwr2 < colors;
+	     ++max_bits, pwr2 <<= 1) {
+	    ;
+	}
+
+	if (tigetflag("RGB") > 0) {
+	    result = OK;
+	    r = g = b = (max_bits + 2) / 3;
+	} else if ((bits = tigetnum("RGB")) > 0) {
+	    result = OK;
+	    r = g = b = bits;
+	} else if ((data = tigetstr("RGB")) != ABSENT_STRING
+		   && data != CANCELLED_STRING
+		   && sscanf(data, "%d/%d/%d%c", &r, &g, &b, &ch) == 3) {
+	    result = OK;
+	}
+
+	if ((r + g + b) < max_bits) {
+	    result = ERR;
+	} else if (result == 0) {
+	    if (r > max_bits) {
+		r = max_bits;
+		g = b = 0;
+	    }
+	    *r_max = r;
+	    if (g > (max_bits -= r)) {
+		g = max_bits;
+		b = 0;
+	    }
+	    *g_max = g;
+	    if (b > (max_bits -= g)) {
+		b = max_bits;
+	    }
+	    *b_max = b;
+	}
+    }
+    return result;
+}
+#else
+#define parse_rgb(r,g,b) (ERR)
+#endif
+
+#endif /* PARSE_RBG_H_incl */