Command line error D8021 : invalid numeric argument '/Wno-unused-parameter

[slogolin]

warning: cl : Command line error D8021 : invalid numeric argument '/Wno-unused-parameter'

error: failed to run custom build command for `clips-sys v0.4.0`
  CC = None
  CFLAGS_x86_64-pc-windows-msvc = None
  CFLAGS = None  CRATE_CC_NO_DEFAULTS = None
  CARGO_CFG_TARGET_FEATURE = Some("fxsr,sse,sse2")
  DEBUG = Some("true")
  running: "C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\BuildTools\\VC\\Tools\\MSVC\\14.29.30133\\bin\\HostX64\\x64\\cl.exe" "-nologo" "-MD" "-Z7" "-Brepro" "-I" "CLIPS/core" "-W4" "-Wno-unused-parameter" "-Wno-missing-field-initializers" "-FoC:\\Users\\..\\project_folder\\target\\debug\\build\\clips-sys-a32bab0ecc4081d2\\out\\CLIPS/core\\agenda.o" "-c" "CLIPS/core\\agenda.c"  cargo:warning=cl : Command line error D8021 : invalid numeric argument '/Wno-unused-parameter'  exit code: 2

  --- stderr
  Filter { iter: Filter { iter: Map { iter: Filter { iter: Map { iter: ReadDir("CLIPS/core") } } } } }


  error occurred: Command "C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\BuildTools\\VC\\Tools\\MSVC\\14.29.30133\\bin\\HostX64\\x64\\cl.exe" "-nologo" "-MD" "-Z7" "-Brepro" "-I" "CLIPS/core" "-W4" "-Wno-unused-parameter" "-Wno-missing-field-initializers" "-FoC:\\Users\\..\\project_folder\\target\\debug\\build\\clips-sys-a32bab0ecc4081d2\\out\\CLIPS/core\\agenda.o" "-c" "CLIPS/core\\agenda.c" with args "cl.exe" did not execute successfully (status code exit code: 2).

I receive this error when attempting to compile clips-sys as part of the clips crate. It seems like this is being caused by a Linux compiler warning for unused parameters. I'm not sure how to locate the unused parameter to fix this.