CVS diff for configure.ac between 1.12 and 1.3:

# Check for TCP_CORK
#AC_MSG_CHECKING(availability of TCP_CORK)
#AC_EGREP_CPP(SUCCESS,
#            [
#               #include <netinet/tcp.h>
#               #ifdef TCP_CORK
#               SUCCESS
#               #endif
#            ],[
#               AC_MSG_RESULT(present)
#               AC_DEFINE([HAVE_TCPCORK], [], [TCP_CORK option is available])
#
#               AC_MSG_CHECKING(whether to use TCP_CORK)
#               AC_ARG_ENABLE(tcpcork,
#                   AC_HELP_STRING([--disable-tcpcork],
#                                  [disable use of TCP_CORK buffering on Linux]),
#                       [
#                        if test "$enableval" = "no"; then
#                            AC_MSG_RESULT(no)
#                        else
#                            AC_MSG_RESULT(yes)
#                            AC_DEFINE([USE_TCPCORK], [], 
#                                      [Use TCP_CORK buffering on Linux])
#                        fi
#                       ],
#                       [
#                        AC_MSG_RESULT(yes)
#                        AC_DEFINE([USE_TCPCORK], [],
#                                  [Use TCP_CORK buffering on Linux])
#                       ])
#            ],[
#               AC_MSG_RESULT(not present)
#            ])
            
## Use sendfile() support?
#AC_MSG_CHECKING(whether to use sendfile)
#AC_ARG_ENABLE(sendfile,
#  AC_HELP_STRING([--disable-sendfile],
#                 [disable sendfile() support, use writev() instead]),
#[
#  if test "$enableval" = "no"; then
#    AC_MSG_RESULT(no)
#  else
#    AC_MSG_RESULT(yes)
#    AC_DEFINE([USE_SENDFILE], [], [Send responses with sendfile()])
#  fi
#],
#[
#  AC_MSG_RESULT(yes)
#  AC_DEFINE([USE_SENDFILE], [], [Send responses with sendfile()])
#])
  

# Enable HTTP PUT requests?
AC_MSG_CHECKING(whether to enable PUT requests)
AC_ARG_ENABLE(put,
  AC_HELP_STRING([--enable-put],
                 [Enable HTTP PUT requests]),
[
  if test "$enableval" = "no"; then
    AC_MSG_RESULT(no)
  else
    AC_MSG_RESULT(yes)
    AC_DEFINE([ENABLE_PUT], [], [Enable PUT requests])
  fi
],
[
  AC_MSG_RESULT(no)
])


# Enable 503 (too busy) HTTP responses?
AC_MSG_CHECKING(whether to send 503 responses when overloaded)
AC_ARG_ENABLE(put,
  AC_HELP_STRING([--enable-503],
                 [Enable HTTP 503 responses when overloaded]),
[
  if test "$enableval" = "no"; then
    AC_MSG_RESULT(no)
  else
    AC_MSG_RESULT(yes)
    AC_DEFINE([ENABLE_503], [], [Enable 503 HTTP responses])
  fi
],
[
  AC_MSG_RESULT(no)
])


# Disable Keep-alive support?
AC_MSG_CHECKING(whether to enable keep-alive connections)
AC_ARG_ENABLE(keepalive,
    AC_HELP_STRING([--disable-keepalive],
                   [disable keep-alive connections]),
        [
         if test "$enableval" = "no"; then
             AC_MSG_RESULT(no)
             AC_DEFINE([DISABLE_KEEPALIVE], [],
                       [Disable persistent connections])
         else
             AC_MSG_RESULT(yes)
         fi
        ],
        [
         AC_MSG_RESULT(yes)
        ])


# Enable epoll-based pth code (highly experimental)
AC_MSG_CHECKING(whether to build Pth on top of epoll (very experimental))
AC_ARG_WITH(epoll,
  AC_HELP_STRING([--with-epoll],
                 [build Pth on top of epoll (very experimental)]),
[
  if test "$withval" = "yes"; then
    AC_MSG_RESULT(yes)
    EPOLL_FLAG="--enable-epoll"
  else
    AC_MSG_RESULT(no)
    EPOLL_FLAG=""
  fi
],
[
  AC_MSG_RESULT(no)
  EPOLL_FLAG=""
])

# Enable dmalloc?
AC_MSG_CHECKING(whether to link with the Dmalloc memory debugger/profiler)
AC_ARG_WITH(dmalloc, 
  AC_HELP_STRING([--with-dmalloc],
                 [link with the Dmalloc memory debugger/profiler]),
[
  if test "$withval" = "yes"; then
    AC_MSG_RESULT(trying)
    AC_CHECK_LIB(dmalloc, dmalloc_malloc)
  else
    AC_MSG_RESULT(no)
  fi
],
[
  AC_MSG_RESULT(no)
])
 

# Check for Pth library
AC_CHECK_PTH(1.3.0, subdir:pth $EPOLL_FLAG, --disable-shared --disable-tests)
AC_CONFIG_SUBDIRS(pth)