Troubleshooting
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When troubleshooting build issues, the following files relative to the build/ directory may be especially useful:

GNUmakefile
     Top-level makefile which contains build settings generated via configure.

log/config.info.txt
     Record of output from configure.

log/config.verbose.txt
     Record of verbose output from configure.

log/build.txt
     Record of output from configure --launch. Similar output may be recorded using make depending on which shell is in use, eg: make >& log/build.txt or make > log/build.txt 2>&1.

log/xcodemake.env.txt
     Environment (variables) dump as seen when Xcode forks make. only.