From cc2847f6fff42e56f5466f4a0b5f639ea1b0a1ea Mon Sep 17 00:00:00 2001
From: Bakul Shah <bakul@bitblocks.com>
Date: Mon, 25 Oct 2021 00:24:08 -0700
Subject: [PATCH] builtin: fix compilation with `-gc boehm` on some FreeBSD
 versions (#12289)

---
 vlib/builtin/builtin_d_gcboehm.c.v | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/vlib/builtin/builtin_d_gcboehm.c.v b/vlib/builtin/builtin_d_gcboehm.c.v
index 658dbc301e..4493cab0df 100644
--- a/vlib/builtin/builtin_d_gcboehm.c.v
+++ b/vlib/builtin/builtin_d_gcboehm.c.v
@@ -1,6 +1,17 @@
 module builtin
 
-#flag -DGC_THREADS=1
+$if freebsd {
+	// Tested on FreeBSD 13.0-RELEASE-p3, with clang, gcc and tcc:
+	#flag -DBUS_PAGE_FAULT=T_PAGEFLT
+	$if !tinyc {
+		#flag -DGC_THREADS=1
+		#flag -DGC_BUILTIN_ATOMIC=1
+		#flag @VEXEROOT/thirdparty/libgc/gc.o
+		#flag -lpthread
+	}
+} $else {
+	#flag -DGC_THREADS=1
+}
 
 $if static_boehm ? {
 	$if macos {