Paul A. Patience schreef op di 19-07-2022 om 07:59 [+0000]: > +    (native-inputs > +     ;; Header-only library > +     (list cgal)) Being header-only makes no difference w.r.t. cross-compilation (and hence, inputs/native-inputs). For examples, headers can potentially contain architecture-specific code (generated at the compile time of the cgal library). As such, this may need to be in 'inputs' instead of 'native-inputs'. Another reason: this should be in 'inputs', otherwise when cross- compiling it will end in in (IIUC) C_INCLUDE_PATH instead of CROSS_C_INLUDE_PATH, whereas the cross-compiler will look in CROSS_C_INCLUDE_PATH and not C_INCLUDE_PATH. Greetings, Maxime.