Trying to compile sage 7.3.beta8 on CentOS6.8, I ran into a problem 
compiling ntl 9.8.1.

Not sure what to include. Just ask. 

Chris


Host system:
Linux pmlapsag01 2.6.32-642.1.1.el6.x86_64 #1 SMP Tue May 31 21:57:07 UTC 
2016 x86_64 x86_64 x86_64 GNU/Linux
****************************************************
C compiler: gcc
C compiler version:
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/sageadm/sage/local/libexec/gcc/x86_64-unknown-linux-gnu/4.9.3/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../src/configure --prefix=/home/sageadm/sage/local 
--with-local-prefix=/home/sageadm/sage/local 
--with-gmp=/home/sageadm/sage/local --with-mpfr=/home/sageadm/sage/local 
--with-mpc=/home/sageadm/sage/local --with-system-zlib --disable-multilib 
--disable-nls --enable-languages=c,c++,fortran --disable-libitm
Thread model: posix
gcc version 4.9.3 (GCC)
****************************************************

Applying patches to NTL.

....

config.status: executing libtool commands

Configuring NTL.
***** checking for libtool *****
libtool (GNU libtool) 2.4.2
Written by Gordon Matzigkeit < ... >, 1996

Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
***** libtool OK *****

*** checking -march=native flag
CXXAUTOFLAGS=" -march=native"
*** -march=native works
CXXAUTOFLAGS=" -march=native"

[ntl-9.8.1.p0] Tuning and building NTL.
[ntl-9.8.1.p0] make[3]: Entering directory 
`/home/sageadm/sage/local/var/tmp/sage/build/ntl-9.8.1.p0/src/ntl/src'
[ntl-9.8.1.p0] make setup1
[ntl-9.8.1.p0] make[4]: Entering directory 
`/home/sageadm/sage/local/var/tmp/sage/build/ntl-9.8.1.p0/src/ntl/src'
[ntl-9.8.1.p0] g++ -I../include -I.  -march=native -O2 -g   -c MakeDescAux.c
[ntl-9.8.1.p0] g++ -I../include -I.  -march=native -O2 -g   
-L/home/sageadm/sage/local/lib -Wl,-rpath,/home/sageadm/sage/local/lib  -o 
MakeDesc MakeDesc.c MakeDescAux.o -lm
[ntl-9.8.1.p0] /tmp/ccPRNw4z.s: Assembler messages:
[ntl-9.8.1.p0] /tmp/ccPRNw4z.s:873: Error: no such instruction: `shlx 
%r12,%rax,%rax'
[ntl-9.8.1.p0] /tmp/ccPRNw4z.s:932: Error: no such instruction: `shlx 
%r12,%rax,%rax'

...

[ntl-9.8.1.p0] /tmp/ccPRNw4z.s:4374: Error: no such instruction: `shlx 
%rax,%r15,%r15'
[ntl-9.8.1.p0] /tmp/ccPRNw4z.s:4791: Error: no such instruction: `shlx 
%r13,%rdx,%rdx'
[ntl-9.8.1.p0] make[4]: *** [setup1] Error 1

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