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Darryl L. MilesandClaude Opus 4.8
c05ac60851
configure already preferred the system readline (AC_CHECK_LIB → -lreadline) and only fell back to the bundled readline/ copy. Remove that fallback: a non-Tcl interactive build now requires the *system* GNU readline -- both its header (AC_CHECK_HEADER readline/readline.h, so configure fails cleanly instead of deep in compilation) and the library -- and if neither Tcl nor readline is available configure errors with a clear explanation of the three ways forward (build with Tcl, install libreadline-dev, or --disable-readline). Also drop the now-meaningless --enable-readline-bundled, and substitute MAKE_READLINE=0 unconditionally so the Makefiles' bundled-readline path goes inert. readline/ and all Makefiles are left untouched here (cleaned up and removed in the following patches). --disable-readline stays as the escape hatch: it just tells configure to ignore the system readline and build the existing no-line-editing variant. Verified: Tcl build rc=0 (readline off, 375 files, readline/ not built); non-Tcl --disable-readline builds (serial); non-Tcl default with no readline dev package now errors with the guidance message. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>