Just want to clarify the minimum supported version of automake,
autoconf, libtool and pthread for libusbx.

As per Pete, autoconf needs to be 2.50 minimum. What
about automake? I think probably 1.10 should be the one to go.
I do not see a problem with these two (automake 1.10 and
autoconf 2.50) in reality.

Automake 1.10.1 is dated 21-Jan-2008.
http://ftp.gnu.org/gnu/automake/

Autoconf 2.50 is dated 21-May-2001 which is
really old.
http://ftp.gnu.org/gnu/autoconf/

libtool is often a problem due to the need to
support Windows.

Eg:  for old version of libtool.
./configure: line 3371: LT_INIT: command not found
./configure: line 3372: syntax error near unexpected token `Windows'
./configure: line 3372: `LT_LANG(Windows Resource)'

>From the past discussion, libtool 2.2.8 release should be the minimum
version (for MinGW-w64 support).
http://sourceforge.net/mailarchive/message.php?msg_id=25711845

libtool 2.2.8 is dated 04-Jun-2010 which is about 2 years
old but I think it is not a big problem to ask users to upgrade
to this version of newer. I have no problems to install libtool
2.4.2 under various version of OpenBSD/NetBSD which comes
with libtool 2.2.6b or older.

What about pthread? I just tried to build libusbx-1.0.11
release under Ubuntu 8.04 (already obsoleted) and it
gives error. I am not saying that libusbx needs to be fixed
to suit for older distros but just wondering what is the
minimum pthread (or glibc) version required.

  CC     libusb_1_0_la-threads_posix.lo
os/threads_posix.c: In function 'usbi_mutex_init_recursive':
os/threads_posix.c:51: error: implicit declaration of function
'pthread_mutexattr_settype'
os/threads_posix.c:51: error: 'PTHREAD_MUTEX_RECURSIVE' undeclared
(first use in this function)
os/threads_posix.c:51: error: (Each undeclared identifier is reported only once
os/threads_posix.c:51: error: for each function it appears in.)
make[2]: [libusb_1_0_la-threads_posix.lo] Error 1 (ignored)



-- 
Xiaofan

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