-- FreeBSD compatibility: link the dynare preprocessor against pthreads.
-- std::thread requires pthreads on FreeBSD; the original code used std::jthread
-- whose thread support was implicitly pulled in by the C++ standard library.
-- After replacing jthread with std::thread, an explicit threads dependency is needed.

--- preprocessor/src/meson.build.orig	2025-03-19 00:00:00 UTC
+++ preprocessor/src/meson.build	2025-03-19 00:00:00 UTC
@@ -1,4 +1,5 @@
 boost_dep = dependency('boost')
+threads_dep = dependency('threads')
 
 ## Flex stuff
 flex_exe = find_program('flex')
@@ -74,6 +75,6 @@
 endif
 
 executable('dynare-preprocessor', preprocessor_src, flex_src, flexlexer_h, bison_src,
-           include_directories : preprocessor_incdir, dependencies : boost_dep,
+           include_directories : preprocessor_incdir, dependencies : [boost_dep, threads_dep],
            link_args : preprocessor_link_args,
            install : true)