2013/10/28 Adrien Destugues <pulkomandy@xxxxxxxxx> > AC_SEARCH_LIBS(cos, m,,AC_MSG_ERROR(no cos method found)) The problem with that is that the error message is totally cryptic, and doesn't even include the name of the library that is moste likely missing. If I see that: "no display_init_fubar method found", I don't know if I need to install libsdl, libgtk, libqt, libx11, libwhatever. Also, if I see "libsdl not found", I'm just going to pull my hair, because I have libsdl 42.17 installed, but display_init_fubar was included in 42.18, and the message gives no sign of that. I think a reasonable error message in this case would be: "no cos method found, usually provided by libm or libmath" Regards, -- Georges Dupéron