SourceLayout: ICMP NetDB libraries

diff --cc configure.in
index 96d9adb1d48fa3299d443bcea6a59ff85750a368,7e9da712c0e404667aaba4249eb910d406547eb5..0e3d42de2e257e989a87ef275c08ba8620ebc07a
--- 1/configure.in
--- 2/configure.in
+++ b/configure.in
@@@ -717,12 -717,10 +717,10 @@@ AC_SUBST(REPL_LIBS
  
  AM_CONDITIONAL(ENABLE_PINGER, false)
  AC_ARG_ENABLE(icmp,
- [  --enable-icmp           Enable ICMP pinging],
+       AC_HELP_STRING([--enable-icmp],[Enable ICMP pinging and Network Measurement]),
  [ if test "$enableval" = "yes" ; then
      echo "ICMP enabled"
-     AC_DEFINE(USE_ICMP,1,
-     [ Defined this to use Squid's ICMP features (highly recommended!)
-       When USE_ICMP is defined, Squid will send ICMP pings to origin server sites.])
 -    AC_DEFINE(USE_ICMP,1,[ Defined to use Squid's ICMP and Network Measurement features (highly recommended!)])
++    AC_DEFINE(USE_ICMP,1,[Define to use Squid's ICMP and Network Measurement features (highly recommended!)])
      AM_CONDITIONAL(ENABLE_PINGER, true)
    fi
  ])