irix[56].*) #(vi
CPPFLAGS="$CPPFLAGS -D_SGI_SOURCE"
;;
linux*|gnu*) #(vi
linux*|mint*|gnu*) #(vi
echo "$as_me:6070: checking if we must define _GNU_SOURCE" >&5
echo $ECHO_N "checking if we must define _GNU_SOURCE... $ECHO_C" >&6