Compilation errors on Ubuntu 18.04

[ddeidda]

Hi,
I am Davide Deidda from AWS ParallelCluster team.
https://github.com/aws/aws-parallelcluster

 We're trying to make Torque to run on Ubuntu 18.04 nodes.

We found some issues at compilation time. Basically we had to set CFLAGS 
to "-fpermissive" and CXXFLAGS to "-std=c++03" to make it work. 
Furthermore, we had to provide external header unicode file (coming from 
Ubuntu 16.04) because of this error:

/usr/include/unicode/umachine.h:347:13: error: ‘char16_t’ does not name 
a type; did you mean ‘wchar_t’?
      typedef char16_t UChar;
              ^~~~~~~~
              wchar_t
In file included from /usr/include/unicode/utypes.h:39:0,
                  from /usr/include/unicode/ucnv_err.h:88,
                  from /usr/include/unicode/ucnv.h:52,
                  from /usr/include/libxml2/libxml/encoding.h:31,
                  from /usr/include/libxml2/libxml/parser.h:810,
                  from node_frequency.cpp:88:

We also tried to build version 6.1.3 (not currently supported on 
ParallelCluster) and we found the same problems.
Do you have any plan about addressing this issue in the next future? Is 
there an official new version in your roadmap?

Best Regards
Davide