docs: Clarify GNU tool dependencies.

westes / flex

The Fast Lexical Analyzer - scanner generator for lexing in C and C++

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docs: Clarify GNU tool dependencies. #637

Closed Mightyjo closed 5 months ago

Mightyjo commented 5 months ago

Clarify and expand tool dependency info in INSTALL.md, particularly with respect to GNU tool variants. Describe minimal troubleshooting steps for failed builds on non-Debian systems.

Refs: #632