Solved. The library 'patterns' was missing.
Added in the preamble: \usetikzlibrary{patterns}Il giorno lun 7 apr 2025 alle ore 08:25 Paolo M < paolo.m.pumilia.gnar...@gmail.com> ha scritto: > Here included two test files embedding a tikz picture exported by xfig. > The first one is correctly previewed, although lines are in black ( white > lines would be better, as lyx is in dark mode) and rendered as pdf. > > The second one cannot be compiled, because apparently a library is > missing? Any help? > > thank you > > p. > > -- --- Paolo M. Pumilia - 347 231 54 96.
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