Re: [Mjpeg-users] Problem compiling mpeg2enc from CVS on Redhat 7.3

[Steven M. S. <sms@2BSD.COM>]

Hi -

> From: Kris Boutilier <Kri...@sc...>
> Making all in mpeg2enc

	Is this with the CVS version or a released tarball kit?

> readpic.cc: In function `void load_frame (int)':
> readpic.cc:363: `PTHREAD_MUTEX_ERRORCHECK' undeclared (first use this

	Hmmm, RH-7.3 must have a goofed up <pthread.h> file then.   I've
	build mjpegtools (the cvs version) on RH-8.0 and -9 plus SuSE 8.1 and
	8.2 and never had a problem

> I beleive it relates to the the reference to AC_GNU_SOURCE in configure.in.
> I'm compiling on Redhat 7.3 which includes autoconf-2.53. Various documents
> suggest the AC_GNU_SOURCE directive is only supported from 2.53b and up.
> I've updated and it still isn't behaving. 

	Did you re-run ./autogen.sh after installing autoconf-2.57 (which I
	believe is the current latest version)?

> Any suggestions?

	Upgrade to RH 8 or 9? ;)

	The other things that can be tried would be to look at <pthread.h>
	and see what '#define' is needed to get that PTHREAD_MUTEX_ERRORCHECK
	defined.   THere are a couple different names for that item though,
	PTHREAD_MUTEX_ERRORCHECK_NP is another one.

	The  PTHREAD_MUTEX_ERRORCHECK related code is a 'safety belt' to
	catch any accidental non-portable mutex use.  Linux threads by default 
	use a non-portable default mutex attribute (not sure about the new
	Posix compatible threads in RH 9).

	Good Luck.

	Steven Schultz