diff -up postgresql-13.1/src/interfaces/Makefile.patch10 postgresql-13.1/src/interfaces/Makefile
--- postgresql-13.1/src/interfaces/Makefile.patch10	2021-02-02 21:33:23.235292305 +0100
+++ postgresql-13.1/src/interfaces/Makefile	2021-02-02 21:33:30.281365440 +0100
@@ -12,7 +12,7 @@ subdir = src/interfaces
 top_builddir = ../..
 include $(top_builddir)/src/Makefile.global
 
-SUBDIRS = libpq ecpg
+SUBDIRS = libpq
 
 $(recurse)