  The traditional construction of Chevalley groups relies on the choice of
certain signs for a Chevalley basis of the underlying Lie
algebra~$\mathfrak{g}$. Recently, Lusztig simplified this construction for
groups of adjoint type by using the "canonical basis" of the adjoint
representation of~$\mathfrak{g}$, in particular, no choices of signs are
required. The purpose of this note is to extend this to Chevalley groups which
are not necessarily of adjoint type, using Jantzen's explicit models of the
minuscule highest weight representations of~$\mathfrak{g}$.
