'libxml/xmlwriter.h' not found after updating to Xcode 7.0.1 and El Capitan

[Marco Giordani]

Hi everybody. I just updated my MacBook to El Capitan and I have now Xcode 7.0.1. When compiling my ns-3 script, I get the following error (I didn't have before the update):

In file included from ../src/config-store/model/config-store.cc:11:
    ../src/config-store/model/xml-config.h:5:10: fatal error: 'libxml/xmlwriter.h' file not found
    #include <libxml/xmlwriter.h>
             ^
    1 error generated.
    Waf: Leaving directory `/Users/marcogiordani/final-ns3-mmwave-dir/build'
    Build failed
     -> task in 'ns3-config-store' failed (exit status 1): 
        {task 4469735696: cxx config-store.cc -> config-store.cc.1.o}
    ['/usr/bin/g++', '-Wall', '-Werror', '-Wno-potentially-evaluated-expression', '-Wno-unused-local-typedefs', '-fPIC', '-I.', '-I..', '-I/usr/include/libxml2', '-DNS3_ASSERT_ENABLE', '-DNS3_LOG_ENABLE', '-DHAVE_SYS_IOCTL_H=1', '-DHAVE_IF_NETS_H=1', '-DHAVE_NET_ETHERNET_H=1', '-DHAVE_SQLITE3=1', '../src/config-store/model/config-store.cc', '-c', '-o', 'src/config-store/model/config-store.cc.1.o']

Any suggestion to this issue?

[Konstantinos]

Hi Marco,

Which NS-3 release are you working with? 

This might be a known issue that has been fixed with the NS-3.24.1 release as there have been some errors with the new Xcode release.

https://www.nsnam.org/wiki/Ns-3.24-errata

Regards,

K.

[Marco Giordani]

Thanks Konstantinos, 

I had already fixed this issue following the guide you have posted, but I still get this problem.

Regards,

Marco

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[Konstantinos]

Does that mean you work with NS-3.24.1 and you still have issues in main ns-3 modules such as config-store?

Please give more details of your system (gcc and python versions)

Marco

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[Marco Giordani]

Dear Konstantinos,

I am not working with version 3.24 but with an older one. Anyway, everything worked fine before I updated to the new OSX El Capitan.

My system has the following specs:

• gcc version: 4.2.1
• Python version: 2.7.10

Thanks,

Marco

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[Tommaso Pecorella]

xmlwriter.h is part of an external library (libxml2 usually).

It is possible that the library has been removed by the Capitain installer, especially if you did install it under /usr through some package manager (fink, homebrew, MacPorts, etc.) or if you did compile and install it by yourself.

The "obvious" solution is to reinstall it and reconfigure ns-3.

As a side note, upgrade to 3.24.1. There is really no excuse to be stuck to an older and buggy version.

T.

Marco

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[Marco Giordani]

Dear Tommaso,

thanks for your help. I just solved the problem by typing on the Terminal:

xcode-select —install

For some reason, when updating to Xcode 7.0.1, the CommandLineTool hadn’t been updated too, so I did it manually. Now everything works fine.

Thanks for your support.

Marco