--- a/ps.c 2010-07-21 23:40:33.000000000 +0300
+++ b/ps.c 2025-10-28 17:36:07.620187163 +0200
@@ -67,10 +67,10 @@
 };
 
 
-static char *readline();
-static char *gettextline();
-static char *gettext();
-static int  blank();
+static char *readline(char *line, int size, FILE *fp, long *position, unsigned *line_len);
+static char *gettextline(char *line);
+static char *gettext(char *line, char **next_char);
+static int  blank(char *line);
 
 /*
  *     psscan -- scan the PostScript file for document structuring comments.