The call to g++ was failing for files that included library headers, since the library -Is weren't passed.
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GL5T36G3A2LUTTYSL7ZQVUYONUCXL5DK36532FM6XRAQCLYDWW2QC
K2CS6TCX2NDVL2ASEHGP4J4K4IJ6FP3ANNKTSIWVG43HPYSBX6ZQC
$(CXX) -MM $(CFLAGS) $$i >>$(DEPENDENCY_MKF).tmp 2>/dev/null; \
$(CXX) -MM $(CFLAGS) $(CFLAGS_L) $$i >>$(DEPENDENCY_MKF).tmp 2>/dev/null; \