ubuntu : __errno_location undefine

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From: "czp.opensource@xxxxxxxxx" <czp.opensource@xxxxxxxxx>
Date: Sat, 9 Feb 2008 00:00:23 -0800 (PST)

hi all:
my code is work well on fedora 7 or fedora 8. now i installed
ubuntu, my code can't compile crrectly.
error is __errno_location function is not defined: undefined
reference to `__errno_location()'
but the function is exectly defined in libpthread.a.
nm /usr/lib/libpthread.a | grep errno
U __errno_location
errno.o:
00000051 T __errno_location
00000000 T __h_errno_location
U __errno_location
U __errno_location

why? help please!

Allen
.

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