Does cstdlib pollute the global namespace?

[Jeff Schwab]

Is the following error message correct?  It seems like system() ought
to be in the ::std namespace.  What am I missing?

    // main.cc
    #include <cstdlib>
    namespace system { }

    $ g++ -ansi -pedantic -Wall -c main.cc
    main.cc:3: error: 'namespace system { }' redeclared as different
kind of symbol
    /usr/include/stdlib.h:738: error: previous declaration of 'int
system(const char*)'
    make: *** [main.o] Error 1

My current work-around is an unnamed "wrapper" namespace:

    namespace { namespace system { } }