I am a libertarian (libertarian, the term that defines "true liberals" according to Erik von Kuehnelt-Leddihn in "The Four Liberalisms"), since the modern liberal defines himself as an enemy of the state (Raimondo Cubbedu, "Atlas del Liberalismo"), I, who want the destruction of the State, am a libertarian.
I am also a libertarian by "liberal tendencies" (von Kuehnelt-Leddihn), i.e., by having a tendency to permit as much negative liberty ("laissez-faire") as possible, something that, if passed from subjective and relative tendency to something more intransigent, is unacceptable (von Kuehnelt-Leddihn, Sardá y Salvany, Mons. Lefebvre, Danilo Castellano).
And finally, I see myself as a libertarian for defending the efficiency of the hoppean private law society in the resolution of conflicts (although i knows its limitations and, like feudalism or "capitalism", it needs to be christianized) and for my intransigent defense of private property, guarantee of liberty (Chesterton, Belloc, Gambra, Fulton Sheen, von Kuehnelt-Leddihn, Corrêa de Oliveira) and essential to christian civilization (Plínio Corrêa de Oliveira, Adolpho Lindenberg).
Since Gary North and Rousas Rushdoony are considered libertarians, i see no reason why a catholic like me should not be considered as such.