diff -ur libnatpmp-20230423/Makefile build/libnatpmp-20230423/Makefile
--- libnatpmp-20230423/Makefile	2013-12-09 15:52:28.000000000 -0500
+++ build/libnatpmp-20230423/Makefile	2024-08-17 01:01:12.098281283 -0400
@@ -56,7 +56,7 @@
 endif
 endif
 
-HEADERS = natpmp.h
+HEADERS = natpmp.h natpmp_declspec.h
 
 EXECUTABLES = testgetgateway natpmpc-shared natpmpc-static
 
