  The present paper is concerned with Ekeland Variational Principle (EkVP) and
its equivalents (Caristi-Kirk fixed point theorem, Takahashi minimization
principle, Oettli-Th\'era equilibrium version of EkVP) in quasi-uniform spaces.
These extend some results proved by Hamel, Nonlinear Anal. \textbf{62} (2005),
913--924, in uniform spaces, as well as those proved in quasi-metric spaces by
various authors. The case of $F$-quasi-gauge spaces, a non-symmetric version of
$F$-gauge spaces introduced by Fang, J. Math. Anal. Appl. \textbf{202} (1996),
398--412, is also considered. The paper ends with the quasi-uniform versions of
some minimization principles proved by Arutyunov and Gel'man, Zh. Vychisl. Mat.
Mat. Fiz. \textbf{49} (2009), 1167--1174, and Arutyunov, Proc. Steklov Inst.
Math. \textbf{291} (2015), no.~1, 24--37, in complete metric spaces.
  Key words: Ekeland Variational Principle, Takahashi minimization principle,
equilibrium problems, uniform spaces, quasi-uniform spaces, gauge spaces,
quasi-gauge spaces, completeness in quasi-uniform spaces
