Testing if -lresolv is necessary or not

gistfile1.txt

AC_CHECK_FUNC(res_mkquery, , 
  [AC_CHECK_LIB(bind, res_mkquery, , 
   [AC_CHECK_LIB(resolv, res_mkquery, , 
	[ saved_LIBS="$LIBS"
	LIBS="$LIBS -lresolv"
	AC_MSG_CHECKING(for res_mkquery in -lresolv again)
	AC_LINK_IFELSE([[
#include <resolv.h>
int main()
{
	res_mkquery (0, 0, 0, 0, 0, 0, 0, 0, 0);
	return 0;
}]],
	LIBS="$saved_LIBS -lresolv"; AC_MSG_RESULT(yes),
	LIBS="$saved_LIBS"; AC_MSG_RESULT(no)
        [AC_MSG_ERROR([No DNS resolver development environment found])])])])])

dnl in the Makefile.in:
dnl LDFLAGS=@LIBS@