Derrick Adam Floyd, Texas state prisoner # 1143954, appeals the district court’s dismissal of his civil rights complaint without prejudice for failure to exhaust administrative remedies. 42 U.S.C. § 1997e(a). We DISMISS the appeal as frivolous.

“Exhaustion is now mandatory, irrespective of the forms of relief sought and offered through administrative avenues.” Days v. Johnson, 322 F.3d 863, 866 (5th Cir. 2003) (citation and quotation marks omitted). A prisoner must exhaust his administrative remedies before filing suit. Wendell v. Asher, 162 F.3d 887, 890-91 (5th Cir. 1998). Section 1997e, 42 U.S.C., does not require a judicial inquiry into the adequacy of available administrative remedies. See 42 U.S.C. § 1997e; Underwood v. Wilson, 151 F.3d 292, 294 (5th Cir. 1998).

Floyd conceded in the district court that he did not file any prison grievances, and he did not assert that he utilized his administrative remedies relative to any defendant. In this court, Floyd makes only conclusional allegations of exhaustion. Because Floyd has not shown that he will present a nonfrivolous issue on appeal, his appeal is DISMISSED. 5th Cm. R. 42.2; see Howard v. King, 707 F.2d 215, 219-20 (5th Cir. 1983).

The dismissal of this appeal as frivolous counts as a “strike” under the Prison Litigation Reform Act. See Adepegba v. Ham-mons, 103 F.3d 383, 387 (5th Cir. 1996). *447 Floyd is CAUTIONED that if he accumulates three strikes under 28 U.S.C. § 1915(g), he will not be able to proceed in forma pauperis in any civil action or appeal filed while he is incarcerated or detained in any facility unless he is under imminent danger of serious physical injury. 28 U.S.C. § 1915(g).

APPEAL DISMISSED AS FRIVOLOUS; SANCTION WARNING ISSUED.