diff -ru source/lib/getprogname.c source-new/lib/getprogname.c
--- source/lib/getprogname.c	2017-01-16 21:36:00.000000000 -0800
+++ source-new/lib/getprogname.c	2017-07-13 16:13:35.966956860 -0700
@@ -43,13 +43,11 @@
 # include <string.h>
 #endif
 
-#ifdef __sgi
 # include <string.h>
 # include <unistd.h>
 # include <stdio.h>
 # include <fcntl.h>
-# include <sys/procfs.h>
-#endif
+# include <limits.h>
 
 #include "dirname.h"
 
@@ -178,7 +176,16 @@
     }
   return NULL;
 # else
-#  error "getprogname module not ported to this OS"
+  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;
 # endif
 }