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We construct novel classes of compact G2 spaces from lifting type IIA fluxbackgrounds with O6 planes. There exists an extension of IIA Calabi-Yauorientifolds for which some of the D6 branes (required to solve the RR tadpole)are dissolved in $F_2$ fluxes. The backreaction of these fluxes deforms theCalabi-Yau manifold into a specific class of SU(3)-structure manifolds. Thelift to M-theory again defines compact G2 manifolds, which in case of toroidalorbifolds are a twisted generalisation of the Joyce construction. Thisobservation also allows a clear identification of the moduli space of a warpedcompactification with fluxes. We provide a few explicit examples, of which somecan be constructed from T-dualising known IIB orientifolds with fluxes. Finallywe discuss supersymmetry breaking in this context and suggest that the purelygeometric picture in M-theory could provide a simpler setting to address someof the consistency issues of moduli stabilisation and de Sitter uplifting.

Compact G2 holonomy spaces from SU(3) structures