Abel Araujo-Avila (Araujo), federal prisoner # 88995-080, appeals the denial of his 18 U.S.C. § 3582(c)(2) motion to reduce sentence. He argues pursuant to Amendment 668 to the Sentencing Guidelines that he is entitled to a role adjustment in his offense level. Araujo, however, has failed to brief the issue whether the district court erred in holding that his motion was merit-less because Amendment 668 has not been designated retroactively applicable under U.S.S.G. § lB1.10(e) (2006). He has therefore waived its review. See Yohey v. Collins, 985 F.2d 222, 225 (5th Cir. 1993).

AFFIRMED.