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#2 rpn_eqn.h NULL declaration error
When building on 64-bit Linux, received several "error: 'NULL' was not declared in this scope" errors for rpn_eqn.h. After adding "#include <stdlib.h>" above the other two include statements at the top of rpn_eqn.h, the NULL errors stopped and the build progressed.
Patch to include stdlib.h to fix NULL errors.