Hi,

configure.ac no longer checks for presence of X11 headers / libs, but the nassink plugin configure.ac snippit reads:
dnl *** nas ***
translit(dnm, m, l) AM_CONDITIONAL(USE_NAS, true)
AG_GST_CHECK_FEATURE(NAS, [nas plug-in], nassink, [
  HAVE_NAS="no"
  if test "x$HAVE_X" = "xyes"; then
    save_cppflags=$CFLAGS
    CPPFLAGS="$CPPFLAGS $X_CFLAGS"
    AG_GST_CHECK_LIBHEADER(NAS, audio, AuOpenServer, $X_LIBS, audio/audiolib.h,
      NAS_LIBS="$X_LIBS -laudio" NAS_CFLAGS="$X_CFLAGS")
    CPPFLAGS="$save_cppflags"
  fi
  AC_SUBST(NAS_CFLAGS)
  AC_SUBST(NAS_LIBS)
])

Notice the check for HAVE_X, the removal of the check for X makes it impossible to build the nassink.

Workaround, do:
export HAVE_X=yes
export X_LIBS=-lX11

Before running ./configure