AC_INIT(nbio.c)AC_CANONICAL_HOSTecho "HOST OS IS $host_os"echo "HOST CPU IS $host_cpu"case $host_os in    solaris*)   PLATFORM=solaris;;    linux-*)    PLATFORM=linux;;esacAC_SUBST(PLATFORM)# See if /dev/poll and devpoll.h existAC_CHECK_FILE(/dev/poll, AC_CHECK_HEADER(sys/devpoll.h, AC_DEFINE(HAS_DEVPOLL)))# Determine JDK installation directoryAC_MSG_CHECKING(Installation path of JDK)AC_ARG_WITH(jdk,        [  --with-jdk              JDK installation directory ],        [ ac_cv_java_home=${with_jdk} ],        [ IFS="${IFS=   }"; ac_save_ifs="$IFS"; IFS=":"  ac_dummy="$PATH"  for ac_dir in $ac_dummy; do    test -z "$ac_dir" && ac_dir=.    if test -f $ac_dir/java; then      ac_cv_prog_java="$ac_dir/java"      break    fi  done  IFS="$ac_save_ifs"  ac_cv_java_home=`echo $ac_cv_prog_java | sed 's+/bin/java$++'` ])AC_MSG_RESULT($ac_cv_java_home)JAVA_HOME=$ac_cv_java_homeAC_SUBST(JAVA_HOME)AC_OUTPUT(Makefile.here)