Index: mono/native/Makefile.am
--- mono/native/Makefile.am.orig
+++ mono/native/Makefile.am
@@ -86,6 +86,8 @@ freebsd_sources = $(unix_sources)
 
 netbsd_sources = $(unix_sources)
 
+openbsd_sources = $(unix_sources)
+
 haiku_sources = $(unix_sources)
 
 android_sources = \
@@ -126,7 +128,7 @@ ios_sources += $(gss_sources)
 android_sources += $(gss_sources)
 endif
 
-EXTRA_libmono_native_la_SOURCES = $(common_sources) $(macos_sources) $(ios_sources) $(linux_sources) $(aix_sources) $(freebsd_sources) $(netbsd_sources) $(haiku_sources) $(unix_sources) $(gss_sources)
+EXTRA_libmono_native_la_SOURCES = $(common_sources) $(macos_sources) $(ios_sources) $(linux_sources) $(aix_sources) $(freebsd_sources) $(netbsd_sources) $(openbsd_sources) $(haiku_sources) $(unix_sources) $(gss_sources)
 
 if MONO_NATIVE_PLATFORM_MACOS
 platform_sources = $(macos_sources)
@@ -149,8 +151,12 @@ else
 if MONO_NATIVE_PLATFORM_NETBSD
 platform_sources = $(netbsd_sources)
 else
+if MONO_NATIVE_PLATFORM_OPENBSD
+platform_sources = $(openbsd_sources)
+else
 if MONO_NATIVE_PLATFORM_HAIKU
 platform_sources = $(haiku_sources)
+endif
 endif
 endif
 endif