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diff --git a/plug-ins/file-sgi/sgi-lib.h b/plug-ins/file-sgi/sgi-lib.h
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+/*
+ * SGI image file format library definitions.
+ *
+ * Copyright 1997-1998 Michael Sweet (mike@easysw.com)
+ *
+ * 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 __SGI_LIB_H__
+#define __SGI_LIB_H__
+
+G_BEGIN_DECLS
+
+/*
+ * Constants...
+ */
+
+# define SGI_MAGIC 474 /* Magic number in image file */
+
+# define SGI_READ 0 /* Read from an SGI image file */
+# define SGI_WRITE 1 /* Write to an SGI image file */
+
+# define SGI_COMP_NONE 0 /* No compression */
+# define SGI_COMP_RLE 1 /* Run-length encoding */
+# define SGI_COMP_ARLE 2 /* Aggressive run-length encoding */
+
+
+/*
+ * Image structure...
+ */
+
+typedef struct
+{
+ FILE *file; /* Image file */
+ int mode, /* File open mode */
+ bpp, /* Bytes per pixel/channel */
+ comp, /* Compression */
+ swapBytes; /* SwapBytes flag */
+ unsigned short xsize, /* Width in pixels */
+ ysize, /* Height in pixels */
+ zsize; /* Number of channels */
+ long firstrow, /* File offset for first row */
+ nextrow, /* File offset for next row */
+ **table, /* Offset table for compression */
+ **length; /* Length table for compression */
+ unsigned short *arle_row; /* Advanced RLE compression buffer */
+ long arle_offset, /* Advanced RLE buffer offset */
+ arle_length; /* Advanced RLE buffer length */
+} sgi_t;
+
+
+/*
+ * Prototypes...
+ */
+
+extern int sgiClose (sgi_t *sgip);
+extern int sgiGetRow (sgi_t *sgip,
+ unsigned short *row,
+ int y,
+ int z);
+extern sgi_t *sgiOpen (const char *filename,
+ int mode,
+ int comp,
+ int bpp,
+ int xsize,
+ int ysize,
+ int zsize);
+extern sgi_t *sgiOpenFile (FILE *file,
+ int mode,
+ int comp,
+ int bpp,
+ int xsize,
+ int ysize,
+ int zsize);
+extern int sgiPutRow (sgi_t *sgip,
+ unsigned short *row,
+ int y,
+ int z);
+
+G_END_DECLS
+
+#endif /* !__SGI_LIB_H__ */