$OpenBSD: patch-configure_ac,v 1.9 2017/09/25 09:16:12 robert Exp $
Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -205,7 +205,7 @@ AC_ARG_ENABLE(Bsymbolic,
               [SAVED_LDFLAGS="${LDFLAGS}"
                AC_MSG_CHECKING([for -Bsymbolic-functions linker flag])
                LDFLAGS=-Wl,-Bsymbolic-functions
-               AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[int main (void) { return 0; }]])],[
+               AC_LINK_IFELSE([AC_LANG_SOURCE([[]], [[int main (void) { return 0; }]])],[
                            AC_MSG_RESULT(yes)
                            enable_Bsymbolic=yes],[
                            AC_MSG_RESULT(no)
@@ -218,7 +218,7 @@ ORC_CFLAGS="$ORC_CFLAGS \$(ERROR_CFLAGS) -I\$(top_srcd
 AC_SUBST(ERROR_CFLAGS)
 AC_SUBST(ORC_CFLAGS)
 
-ORC_LIBS="\$(top_builddir)/orc/liborc-$ORC_MAJORMINOR.la $LIBM $LIBRT"
+ORC_LIBS="\$(top_builddir)/orc/liborc-$ORC_MAJORMINOR.la $LIBM $LIBRT $PTHREAD_LIBS"
 AC_SUBST(ORC_LIBS)
 
 #CFLAGS=`echo $CFLAGS | sed s/O2/O0/`
