--- a/libmailutils/diag/bt.c
+++ b/libmailutils/diag/bt.c
@@ -45,7 +45,7 @@
   
   if (!mu_program_name)
     abort ();
-  sprintf (fname, "/tmp/mailutils.%s.%lu",
+  sprintf (fname, "@TERMUX_PREFIX@/tmp/mailutils.%s.%lu",
 	   mu_program_name, (unsigned long) master_pid);
   
   pid = fork ();
@@ -67,7 +67,7 @@
   dup2 (fd, 2);
   close (fd);
   
-  argv[0] = "/usr/bin/gdb";
+  argv[0] = "@TERMUX_PREFIX@/bin/gdb";
   argv[1] = (char*) mu_full_program_name;
   sprintf (buf, "%lu", (unsigned long) master_pid);
   argv[2] = buf;