--- src/Makefile.am.orig	2020-03-23 12:41:03 UTC
+++ src/Makefile.am
@@ -139,6 +139,8 @@ libunwind_la_SOURCES_os_hpux = os-hpux.c
 
 libunwind_la_SOURCES_os_freebsd = os-freebsd.c
 
+libunwind_la_SOURCES_os_bsdsunix = os-bsdsunix.c
+
 libunwind_dwarf_common_la_SOURCES = dwarf/global.c
 
 libunwind_dwarf_local_la_SOURCES = \
@@ -418,6 +420,17 @@ if OS_FREEBSD
  libunwind_coredump_la_SOURCES += coredump/_UCD_access_reg_freebsd.c
 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_coredump_la_SOURCES += coredump/_UCD_access_reg_bsdsunix.c
+endif
+
 if ARCH_ARM
  lib_LTLIBRARIES += libunwind-arm.la
  libunwind_la_SOURCES = $(libunwind_la_SOURCES_arm)
@@ -574,6 +587,7 @@ EXTRA_DIST =	$(libunwind_la_SOURCES_arm)
 		$(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_common)			\