$OpenBSD: patch-configure,v 1.10 2017/06/09 15:09:51 dcoppa Exp $

Index: configure
--- configure.orig
+++ configure
@@ -16001,7 +16001,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$
 
 echo "$as_me: this is boost.m4 serial 26" >&5
 boost_save_IFS=$IFS
-boost_version_req=1.60
+boost_version_req=1.58
 IFS=.
 set x $boost_version_req 0 0 0
 IFS=$boost_save_IFS
@@ -19500,7 +19500,7 @@ CPPFLAGS=$boost_thread_save_CPPFLAGS
 
 
 
-LDFLAGS+="$LDFLAGS $BOOST_THREAD_LDFLAGS"
+LDFLAGS="$LDFLAGS $BOOST_THREAD_LDFLAGS"
 LIBS="$LIBS $BOOST_THREAD_LIBS"
 
 # icu
