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diff --git a/plug-ins/flame/libifs.h b/plug-ins/flame/libifs.h
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+/*
+    flame - cosmic recursive fractal flames
+    Copyright (C) 1992  Scott Draves <spot@cs.cmu.edu>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+
+#ifndef libifs_included
+#define libifs_included
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+
+#include "cmap.h"
+
+#define EPS (1e-10)
+
+#define variation_random (-1)
+
+#define NVARS   29
+#define NXFORMS 6
+
+typedef double point[3];
+
+typedef struct {
+   double var[NVARS];   /* normalized interp coefs between variations */
+   double c[3][2];      /* the coefs to the affine part of the function */
+   double density;      /* prob is this function is chosen. 0 - 1 */
+   double color;        /* color coord for this function. 0 - 1 */
+} xform;
+
+typedef struct {
+   xform xform[NXFORMS];
+   clrmap cmap;
+   double time;
+   int  cmap_index;
+   double brightness;           /* 1.0 = normal */
+   double contrast;             /* 1.0 = normal */
+   double gamma;
+   int  width, height;          /* of the final image */
+   int  spatial_oversample;
+   double center[2];             /* camera center */
+   double zoom;                  /* effects ppu and sample density */
+   double pixels_per_unit;       /* and scale */
+   double spatial_filter_radius; /* variance of gaussian */
+   double sample_density;        /* samples per pixel (not bucket) */
+   /* in order to motion blur more accurately we compute the logs of the
+      sample density many times and average the results.  we interpolate
+      only this many times. */
+   int nbatches;
+   /* this much color resolution.  but making it too high induces clipping */
+   int white_level;
+   int cmap_inter; /* if this is true, then color map interpolates one entry
+		      at a time with a bright edge */
+   double pulse[2][2]; /* [i][0]=magnitude [i][1]=frequency */
+   double wiggle[2][2]; /* frequency is /minute, assuming 30 frames/s */
+} control_point;
+
+
+
+extern void iterate(control_point *cp, int n, int fuse, point points[]);
+extern void interpolate(control_point cps[], int ncps, double time, control_point *result);
+extern void tokenize(char **ss, char *argv[], int *argc);
+extern void print_control_point(FILE *f, control_point *cp, int quote);
+extern void random_control_point(control_point *cp, int ivar);
+extern void parse_control_point(char **ss, control_point *cp);
+extern void estimate_bounding_box(control_point *cp, double eps, double *bmin, double *bmax);
+extern double standard_metric(control_point *cp1, control_point *cp2);
+extern double random_uniform01(void);
+extern double random_uniform11(void);
+extern double random_gaussian(void);
+extern void mult_matrix(double s1[2][2], double s2[2][2], double d[2][2]);
+void copy_variation(control_point *cp0, control_point *cp1);
+#endif