Out of tree build doesn't work for guacamole-server

[Hardening <rd...@gmail.com>]

Hello,

it seems like out-of-tree builds don't work (at least under Ubuntu 16.04):

# mkdir output && cd output
# ../configure
...
# make
make  all-recursive
make[1]: Entering directory
'/home/david/dev/git/incubator-guacamole-server/output'
Making all in src/libguac
make[2]: Entering directory
'/home/david/dev/git/incubator-guacamole-server/output/src/libguac'
  CC       libguac_la-audio.lo
In file included from ../../../src/libguac/audio.c:22:0:
../../../src/libguac/raw_encoder.h:26:19: fatal error: audio.h: No such
file or directory
compilation terminated.
Makefile:610: recipe for target 'libguac_la-audio.lo' failed
make[2]: *** [libguac_la-audio.lo] Error 1
make[2]: Leaving directory
'/home/david/dev/git/incubator-guacamole-server/output/src/libguac'
Makefile:490: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory
'/home/david/dev/git/incubator-guacamole-server/output'
Makefile:422: recipe for target 'all' failed
make: *** [all] Error 2

Seems like it's just a trivial include path bug (as it works like a
charm when the compilation is done in the tree).

Best regards.

-- 
David FORT
website: http://www.hardening-consulting.com/