--- src/Makefile.am.orig	2020-11-11 02:14:18.000000000 +1000
+++ src/Makefile.am	2021-12-02 23:01:39.357424000 +1000
@@ -152,6 +152,8 @@
 
 libunwind_la_SOURCES_os_freebsd = os-freebsd.c
 
+libunwind_la_SOURCES_os_bsdsunix = os-bsdsunix.c
+
 libunwind_la_SOURCES_os_qnx = os-qnx.c
 
 libunwind_la_SOURCES_os_solaris = os-solaris.c
@@ -527,6 +529,19 @@
  libunwind_la_SOURCES_os_local	= $(libunwind_la_SOURCES_os_hpux_local)
 endif
 
+if OS_BSDSUNIX
+ libunwind_la_SOURCES_os	= $(libunwind_la_SOURCES_os_bsdsunix)
+ libunwind_la_SOURCES_os_local	= $(libunwind_la_SOURCES_os_bsdsunix_local)
+ libunwind_la_SOURCES_x86_os          = x86/Gos-bsdsunix.c
+ libunwind_x86_la_SOURCES_os	      = x86/getcontext-bsdsunix.S
+ libunwind_la_SOURCES_x86_os_local    = x86/Los-bsdsunix.c
+ libunwind_la_SOURCES_x86_64_os       = x86_64/Gos-bsdsunix.c
+ libunwind_la_SOURCES_x86_64_os_local = x86_64/Los-bsdsunix.c
+ libunwind_la_SOURCES_arm_os          = arm/Gos-bsdsunix.c
+ libunwind_la_SOURCES_arm_os_local    = arm/Los-bsdsunix.c
+ libunwind_coredump_la_SOURCES += coredump/_UCD_access_reg_bsdsunix.c
+endif
+
 if OS_FREEBSD
  libunwind_la_SOURCES_os	= $(libunwind_la_SOURCES_os_freebsd)
  libunwind_la_SOURCES_os_local	= $(libunwind_la_SOURCES_os_freebsd_local)
@@ -746,6 +761,7 @@
 		$(libunwind_la_SOURCES_sh)			\
 		$(libunwind_la_SOURCES_x86)			\
 		$(libunwind_la_SOURCES_os_freebsd)		\
+		$(libunwind_la_SOURCES_os_bsdsunix)		\
 		$(libunwind_la_SOURCES_os_linux)		\
 		$(libunwind_la_SOURCES_os_hpux)			\
 		$(libunwind_la_SOURCES_os_qnx)			\