Bug#719741: opencv: FTBFS on !linux archs

[Pino Toscano]

Source: opencv
Version: 2.4.5+dfsg-0exp1
Severity: serious
Tags: patch
Justification: fails to build from source (but built successfully in the past)

Hi,

opencv 2.4.5+dfsg-0exp1 fails to build on non-Linux archs [1][2][3].

Attached there are two patches fixing the issues:

* non-linux.diff: upstream changes
- include some Linux headers (and use sysconf to get the active
  processors count) also when using GNU libc
- do not include sys/sysctl.h on Hurd, since this non-standard include
  does not exist there

* non-linux-debian.diff: Debian-only changes
- build 1394 and v4l support only on Linux; the v4l support would be
  detected and enabled on kFreeBSD, but the actual implementation seems
  Linux-specific

[1] https://buildd.debian.org/status/fetch.php?pkg=opencv&arch=kfreebsd-i386&ver=2.4.5%2Bdfsg-0exp1&stamp=1375854567
[2] https://buildd.debian.org/status/fetch.php?pkg=opencv&arch=kfreebsd-amd64&ver=2.4.5%2Bdfsg-0exp1&stamp=1375849913
[3] https://buildd.debian.org/status/fetch.php?pkg=opencv&arch=hurd-i386&ver=2.4.5%2Bdfsg-0exp1&stamp=1376429030

Thanks,
-- 
Pino
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