John E. Malmberg convinced me to standardize on #ifs for defined
values instead of non-zero.
diff --git a/receiver.c b/receiver.c
index b674c14..2f4bc7a 100644
--- a/receiver.c
+++ b/receiver.c
@@ -228,7 +228,7 @@
 	if (flush_write_file(fd) < 0)
 		goto report_write_error;
 
-#if HAVE_FTRUNCATE
+#ifdef HAVE_FTRUNCATE
 	if (inplace && fd != -1)
 		ftruncate(fd, offset);
 #endif