Index: Makefile
===================================================================
--- Makefile	(revision 11248)
+++ Makefile	(revision 11249)
@@ -1,3 +1,4 @@
 CFLAGS = -Wall -g -ansi -pedantic
 
-parse.o: parse.c
+parse.o: parse.c uhpgl_math.h libuhpgl.h
+
Index: parse.c
===================================================================
--- parse.c	(revision 11248)
+++ parse.c	(revision 11249)
@@ -21,19 +21,13 @@
 */
 
 #include <stdlib.h>
-#include <math.h>
 #include <ctype.h>
+#include "uhpgl_math.h"
 #include "libuhpgl.h"
 #include "parse.h"
 
 #define inst2num(s1, s2) ((((int)s1) << 8) | (int)s2)
 
-#define CONST_PI       3.14159265358979323846
-#define RAD2DEG(r)     ((r) * 180.0 / CONST_PI)
-#define DEG2RAD(d)     ((d) * CONST_PI / 180.0)
-#define DDIST(dx, dy)  sqrt((double)(dx)*(double)(dx) + (double)(dy)*(double)(dy))
-
-
 /* Implementation idea borrowed from an old gcc */
 static double ROUND(double x)
 {
Index: uhpgl_math.h
===================================================================
--- uhpgl_math.h	(nonexistent)
+++ uhpgl_math.h	(revision 11249)
@@ -0,0 +1,36 @@
+/*
+    libuhpgl - the micro HP-GL library
+    Copyright (C) 2017  Tibor 'Igor2' Palinkas
+
+    This library 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 2.1 of the License, or (at your option) any later version.
+
+    This library 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 this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+
+    This library is part of pcb-rnd: http://repo.hu/projects/pcb-rnd
+*/
+
+/* Math helper for internal use - not intended to be included by the
+   library user */
+
+#ifndef LIBUHPGL_MATH_H
+#define LIBUHPGL_MATH_H
+
+#include <math.h>
+
+#define CONST_PI       3.14159265358979323846
+#define RAD2DEG(r)     ((r) * 180.0 / CONST_PI)
+#define DEG2RAD(d)     ((d) * CONST_PI / 180.0)
+#define DDIST(dx, dy)  sqrt((double)(dx)*(double)(dx) + (double)(dy)*(double)(dy))
+
+#endif