Option is for WASM only, so shouldn't be named --with-main-module. Also the option's default value changed since it was introduced, so the documentation became outdated. See commits: fe678ffc6f6f0e851c3b7b7b0c8a1b8219b819a2 Emscripten: No need to pass --with-main-module into build configure 437b4d802ccec2eb1395a4e4137a4a0af039de5a Fix default value of Emscripten --with-main-module 8aef8c3a1451b2fce37a21870a004855822ee335 Make it possible to run either Writer or Calc in the same Emscripten thing 97ee126d69859d01abfbdb55450d27afb71bf9b1 WASM add Calc as optional build result, make it build & run Change-Id: I29aeeb9a840ec07e46cbf153c535b3fca9d88cd1 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/182798 Tested-by: Jenkins Reviewed-by: Moritz Duge <moritz.duge@allotropia.de>