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A filename ending in .mq4 selects the MT4 MetaEditor (COMPILE_MT4_TERMINAL_DIR, default compile-mt4/ beside terminals/) and returns ex4_base64; everything else is MQL5 exactly as before. Compile-only: no MT4 terminal, account or tester. The MT4 toolchain gets its own local mirror under <cache>/mt4, and MT4 responses carry no include_hash. scripts/install-mt4-compiler.bat is a one-time, never-fatal boot step, called from start.bat, that installs MT4 from compile-mt4/mt4setup.exe (the installer ignores /path:, so it copies out of %APPDATA%) and runs terminal.exe /portable once so MQL4\Include exists. Its boot path was verified live only up to the manual steps; the rewritten script itself was not re-run end to end.
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POST /compilegains MQL4: afilenameending in.mq4selects the MT4 MetaEditor (COMPILE_MT4_TERMINAL_DIR) and returnsex4_base64; everything else is MQL5 exactly as before. Compile-only — no MT4 terminal, account or tester. The MT4 toolchain gets its own local mirror under<cache>/mt4, and MT4 responses carry noinclude_hash.scripts/install-mt4-compiler.batinstalls MT4 once on boot fromcompile-mt4/mt4setup.exe; it is never fatal.Tests:
tests/test_compile.pyMQL4 cases.