project Zlib is   for Languages use ("Ada");   for Source_Dirs use (".");   for Object_Dir use ".";   for Main use ("test.adb", "mtest.adb", "read.adb");   package Compiler is      for Default_Switches ("ada") use ("-gnatwbcfilopru", "-gnatVcdfimorst", "-gnatyabcefhiklmnoprst");   end Compiler;   package Linker is      for Default_Switches ("ada") use ("-lz");   end Linker;   package Builder is      for Default_Switches ("ada") use ("-s", "-gnatQ");   end Builder;end Zlib;