AC_CACHE_CHECK([for n_un in struct nlist], ac_cv_struct_nlist_n_un,
[AC_TRY_COMPILE([#include <nlist.h>],
[struct nlist n; n.n_un.n_name = 0;],
ac_cv_struct_nlist_n_un=yes, ac_cv_struct_nlist_n_un=no)])
if test $ac_cv_struct_nlist_n_un = yes; then
AC_CACHE_CHECK([for n_un in struct nlist], ac_cv_struct_nlist_n_un,
[AC_TRY_COMPILE([#include <nlist.h>],
[struct nlist n; n.n_un.n_name = 0;],
ac_cv_struct_nlist_n_un=yes, ac_cv_struct_nlist_n_un=no)])
if test $ac_cv_struct_nlist_n_un = yes; then