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<title>Can I get output of external program as a variable in a Jamfile?
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="bbv2.faq.external"></a>Can I get output of external program as a variable in a Jamfile?
</h2></div></div></div>
<p>From time to time users ask how to run an external program and save
the result in Jamfile variable, something like:
</p>
<pre class="programlisting">
local gtk_includes = [ RUN_COMMAND gtk-config ] ;
</pre>
<p>
Unfortunately, this is not possible at the moment. However, if the
result of command invocation is to be used in a command to some tool,
and you're working on Unix, the following workaround is possible.
</p>
<pre class="programlisting">
alias gtk+-2.0 : : : :
<cflags>"`pkg-config --cflags gtk+-2.0`"
<inkflags>"`pkg-config --libs gtk+-2.0`"
;
</pre>
<p>
If you use the "gtk+-2.0" target in sources, then the properties
specified above will be added to the build properties and eventually
will appear in the command line. Unix command line shell processes
the backticks quoting by running the tool and using its output --
which is what's desired in that case. Thanks to Daniel James for
sharing this approach.
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