With boost 1.88, two includes are explicitly needed for the NasalHash
to compile. Still compiles with boost 1.84.

Index: Makefile
===================================================================
RCS file: /cvs/ports/graphics/simgear/Makefile,v
diff -u -p -r1.24 Makefile
--- Makefile	30 Mar 2024 16:43:41 -0000	1.24
+++ Makefile	22 Apr 2025 18:45:10 -0000
@@ -1,6 +1,7 @@
 COMMENT =		library set for simulations, games and visualizations
 
 DISTNAME =		simgear-2020.3.19
+REVISION =		0
 
 SHARED_LIBS +=  SimGearCore               7.0 # 2.10
 SHARED_LIBS +=  SimGearScene              7.0 # 2.10
Index: patches/patch-simgear_nasal_cppbind_NasalHash_hxx
===================================================================
RCS file: patches/patch-simgear_nasal_cppbind_NasalHash_hxx
diff -N patches/patch-simgear_nasal_cppbind_NasalHash_hxx
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ patches/patch-simgear_nasal_cppbind_NasalHash_hxx	22 Apr 2025 18:45:10 -0000
@@ -0,0 +1,12 @@
+Index: simgear/nasal/cppbind/NasalHash.hxx
+--- simgear/nasal/cppbind/NasalHash.hxx.orig
++++ simgear/nasal/cppbind/NasalHash.hxx
+@@ -24,6 +24,8 @@
+ 
+ #include <simgear/structure/map.hxx>
+ #include <boost/iterator/iterator_facade.hpp>
++#include <boost/mpl/if.hpp>
++#include <boost/type_traits/is_convertible.hpp>
+ 
+ namespace nasal
+ {