Lighttpd

Hi there,
I want to make a modified version of lighttpd on my debian V-Server

I'm following this tutorial:
http://h264.code-shop.com/trac/wiki/Mod-H264-Streaming-Lighttpd-Version2

when I have to run ./configure, the shell will return

  ...
        checking for pkg-config... no
        checking for libev support... ./configure: line 12184: syntax error near unexpected token `LIBEV,'
./configure: line 12184: `      PKG_CHECK_MODULES(LIBEV, libev, ,'
root@foo...

Source at this line is:

LIBEV_CFLAGS="" 
LIBEV_LIBS="" 

    if test "$WITH_LIBEV" != "no"; then
            PKG_CHECK_MODULES(LIBEV, libev, ,
                    dnl no pkg-config for libev, searching manually:

                    if test "$WITH_LIBEV" != "yes"; then
                            LIBEV_CFLAGS="-I$WITH_LIBEV/include" 
                            LIBEV_LIBS="-L$WITH_LIBEV/lib -lev" 
  else

          AC_CHECK_HEADERS([ev.h],[
                                AC_CHECK_LIB([ev], [ev_loop], [
                                                LIBEV_CFLAGS="" 
                                                LIBEV_LIBS="-lev" 
                                        ],[
                                        AC_MSG_ERROR([libev not found])
                                        ]
                                )],[
                                        AC_MSG_ERROR([libev not found])
                                ]
                        )
                fi
        )

I have no Idea how to fix this ...