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copied!<p>The first line:</p> <pre><code>SDKROOT= make -C $TEMP_DIR -f $PROJECT_DIR/greg/Makefile VPATH=$PROJECT_DIR/greg || exit $? </code></pre> <ul> <li><code>SDKROOT=</code> sets the environment variable <code>SDKROOT</code> to nothing for the execution of the <code>make</code> command.</li> <li><code>make</code> is the build tool, and it's being run with the following options: <ul> <li><code>-C $TEMP_DIR</code>: means run <code>make</code> in the directory <code>$TEMP_DIR</code></li> <li><code>-f $PROJECT_DIR/greg/Makefile</code> specifies to <code>make</code> to use the Makefile in <code>$PROJECT_DIR/greg</code></li> <li><code>VPATH=$PROJECT_DIR/greg</code> sets another variable, <code>VPATH</code> to <code>$PROJECT_DIR/greg</code>. <code>VPATH</code> specifies to <code>make</code> <a href="http://www.gnu.org/software/make/manual/html_node/General-Search.html#General-Search" rel="nofollow">a search path for prerequisits</a>.</li> </ul></li> <li><code>|| exit $?</code> means that if the <code>make</code> command fails the script should exit with the same error code as <code>make</code>, as <code>$?</code> means <em>the return code of the last run program/command</em>.</li> </ul> <p>The second line:</p> <pre><code>$TEMP_DIR/greg -o $DERIVED_FILES_DIR/${INPUT_FILE_BASE}.m $INPUT_FILE_PATH </code></pre> <p>appears to be running the command <code>$TEMP_DIR/greg</code> with the option <code>-o $DERIVED_FILES_DIR/${INPUT_FILE_BASE}.m</code> and with some input from <code>$INPUT_FILE_PATH</code>. This looks like the program which may have been built from the previous line's <code>make</code> command, so it's hard to know exactly what it does.</p> <h3>EDIT</h3> <p>The SDKROOT is an environment variable used by XCode to say where the SDK it's using is installed. It will be a path like <code>/Developer/SDKs/MacOSX"${HOST_VERSION}".sdk/</code> for instance. The value should be setup somewhere in XCode I imagine (I don't used xcode so can't be more helpful than that.). By doing <code>SDKROOT=</code> at the beginning of the command the value of <code>SDKROOT</code> will be nothing/blank. The reason for this is that the code being compiled will use resources which exist in the <code>SDKROOT</code>, rather than local ones; such resources may be classes, config or libraries for example.</p>

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