diff '--color=auto' -ur source/srclib/getprogname.c source-new/srclib/getprogname.c
--- source/srclib/getprogname.c	2022-01-04 19:33:29.000000000 +1100
+++ source-new/srclib/getprogname.c	2024-11-24 00:42:48.384997609 +1100
@@ -28,6 +28,14 @@
 # include <string.h>
 #endif
 
+#if defined(__redox__)
+# include <string.h>
+# include <unistd.h>
+# include <stdio.h>
+# include <fcntl.h>
+# include <limits.h>
+#endif
+
 #ifdef __MVS__
 # ifndef _OPEN_SYS
 #  define _OPEN_SYS
@@ -287,6 +295,17 @@
       close (fd);
     }
   return "?";
+# elif defined(__redox__)
+  char filename[PATH_MAX];
+  int fd = open ("sys:exe", O_RDONLY);
+  if (fd > 0) {
+    int len = read(fd, filename, PATH_MAX-1);
+    if (len > 0) {
+       filename[len] = '\0';
+       return strdup(filename);
+    }
+  }
+  return NULL;
 # else
 #  error "getprogname module not ported to this OS"
 # endif