https://bugs.gentoo.org/944996

--- a/vxp2ps/vxp2ps.c
+++ b/vxp2ps/vxp2ps.c
@@ -144,7 +144,7 @@
 }
 #endif
 
-void ps_init()
+void ps_init(FILE* fo)
 {
   fprintf(fo, "%%!PS-Adobe-2.0\n");
   fprintf(fo, "%%%%Creator: vxp2ps\n");
--- a/vxp2ps/vxp2tex.c
+++ b/vxp2ps/vxp2tex.c
@@ -29,7 +29,7 @@
 #define DRAWOP 0x3000300
 #define FILLOP 0x2492000
 
-void ps_init()
+void ps_init(FILE* fo)
 {
   fprintf(fo, "%%!PS-Adobe-2.0\n");
   fprintf(fo, "%%%%Creator: vxp2tex\n");