diff -ruN gnupg-2.2.28-orig/configure gnupg-2.2.28/configure
--- gnupg-2.2.28-orig/configure	2021-06-10 11:58:46.000000000 -0500
+++ gnupg-2.2.28/configure	2021-06-12 05:29:45.000000000 -0500
@@ -10639,10 +10639,13 @@
 #include <ldap.h>
 #endif
 
+int rc;
+LDAP *ld;
+
 int
 main ()
 {
-ldap_open("foobar",1234);
+rc = ldap_create(&ld);
   ;
   return 0;
 }