./configure needs to be regarded as needed for build.
---
Index: proftpd-mod-proxy/.gitignore
===================================================================
--- proftpd-mod-proxy.orig/.gitignore	2020-10-01 23:28:13.210133970 +0200
+++ proftpd-mod-proxy/.gitignore	2020-10-01 23:30:01.138697134 +0200
@@ -1,4 +1,3 @@
-configure
 Makefile
 config.log
 config.status
