config_query_option  FLTK_SHARED  "Build shared libraries?"  y  \
                     "--enable-shared"  "--disable-shared"      &&
config_query_option  FLTK_THREADS  "Enable multithreading support?"  n  \
                     "--enable-threads"  "--disable-threads"            &&
config_query_option  FLTK_XDBE  "Enable the X double-buffer extensions?"  n  \
                     "--enable-xdbe"  "--disable-xdbe"
