K 10
svn:author
V 7
antoine
K 8
svn:date
V 27
2020-01-03T10:05:21.966243Z
K 7
svn:log
V 542
MFH: r521828

Attempt to fix build after removal of Linux c6.

- Replace build dependency on linux-c7-devtools with
  USE_LINUX=devtools:build so it takes into account LINUX_DEFAULT.
- Install libusb.so.3 which is the SONAME of the library.
- Disable -Werror.
- Don't build profiling library.  It's not installed and -pg and
  -fstack-protector are incompatible.
- Don't let the build make parse /etc/make.conf because this may redefine
  *FLAGS.  The file is already handled by the ports tree.
- Create symbolic links instead of hard links.

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