conditional sources with libtool error?

[Matthias Braun]

Hello,

I'm quite new to automake so I don't know if the following is a bug or an error 
from me:

I use the following Makefile.am:
---
EXTRA_libsal_la_SOURCES=wtask.cxx
if USE_WINTASK
 TASKSOURCES=wtask.cxx
endif

EXTRA_libsal_la_SOURCES+=ptask.cxx
if USE_PTHREAD
 TASKSOURCES=ptask.cxx
endif

libsal_la_SOURCES = ... $(TASKSOURCES)
---

but automake 1.5 complains about it with an:
warning: automake does not support conditional definition of TASKSOURCES in 
libsal_la_SOURCES

Greetings
          Matze


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