NETBSD_FLAG_TO_FP_C
l->l_md.md_flags &= ~NETBSD_FLAG_TO_FP_C(FP_X_IMP);
l->l_md.md_flags |= NETBSD_FLAG_TO_FP_C(new_flags);
#define SET_FP_C_FLAG(fp_c, m) (CLEAR_FP_C_FLAG(fp_c) | NETBSD_FLAG_TO_FP_C(m))
do curlwp->l_md.md_flags |= NETBSD_FLAG_TO_FP_C(f); \