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→Step 2: Change your $PATH global
<code>export PATH=/usr/include/sys:/usr/include:/opt/local/bin:/opt/local/sbin:$PATH</code>
/usr/include/(sys) contains the sys/sdt.h header you need. The other 2 help resolve a possible issue when compiling on Mac (Your compiler may say libIDL and GLib cannot be found- even after installing it, this should resolve it).
==Step 3: .Mozconfig file==