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diff --git a/target/prand.h b/target/prand.h
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+
+#ifndef PRAND_H
+
+/* 
+ * Argyll Color Correction System
+ *
+ * Perceptual space random test point class
+ *
+ * Author: Graeme W. Gill
+ * Date:   12/9/2004
+ *
+ * Copyright 2004 Graeme W. Gill
+ * All rights reserved.
+ *
+ * This material is licenced under the GNU AFFERO GENERAL PUBLIC LICENSE Version 3 :-
+ * see the License.txt file for licencing details.
+ */
+
+/* A sample point node */
+struct _prnode {
+	int fx;				/* nz if point is fixed */
+	double p[MXTD];		/* Device coordinate position */
+	double v[MXTD];		/* Subjective value (Labk) */
+}; typedef struct _prnode prnode;
+
+
+/* Main object */
+struct _prand {
+/* private: */
+	int di;			/* Point dimensionality */
+	double ilimit;	/* Ink limit - limit on sum of p[] */
+	int fnp;		/* Number of existing fixed points in list */
+	int tinp;		/* target number of total points in list, including fixed points */
+
+	int np;			/* Number of points currently in list */
+	prnode *n;		/* tinp list of points */
+
+	/* Perceptual function handed in */
+	void (*percept)(void *od, double *out, double *in);
+	void *od;		/* Opaque data for perceptual point */
+	
+	/* Unbounded perceptual model */
+	double *pmod;
+	int pmod_init;		/* It's been initialised */
+
+	/* Other info */
+	int rix;			/* Next read index */
+
+/* public: */
+	/* Initialise, ready to read out all the points */
+	void (*reset)(struct _prand *s);
+
+	/* Read the next set of non-fixed points values */
+	/* return non-zero when no more points */
+	int (*read)(struct _prand *s, double *d, double *p);
+
+	/* Destroy ourselves */
+	void (*del)(struct _prand *s);
+
+	}; typedef struct _prand prand;
+
+/* Constructor */
+extern prand *new_prand(int di, double ilimit, int npoints,
+	fxpos *fxlist, int fxno, int quasi,
+	void (*percept)(void *od, double *out, double *in), void *od);
+
+#define PRAND_H
+#endif /* PRAND_H */