diff --git a/lld/COFF/Driver.cpp b/lld/COFF/Driver.cpp
--- a/lld/COFF/Driver.cpp
+++ b/lld/COFF/Driver.cpp
@@ -1588,13 +1588,25 @@
   {
     llvm::TimeTraceScope timeScope2("Search paths");
     searchPaths.emplace_back("");
-    // Prefer the Clang provided builtins over the ones bundled with MSVC.
-    addClangLibSearchPaths(argsArr[0]);
+    if (!config->mingw) {
+      // Prefer the Clang provided builtins over the ones bundled with MSVC.
+      // In MinGW mode, the compiler driver passes the necessary libpath
+      // options explicitly.
+      addClangLibSearchPaths(argsArr[0]);
+    }
     for (auto *arg : args.filtered(OPT_libpath))
       searchPaths.push_back(arg->getValue());
-    detectWinSysRoot(args);
-    if (!args.hasArg(OPT_lldignoreenv) && !args.hasArg(OPT_winsysroot))
-      addLibSearchPaths();
+    if (!config->mingw) {
+      // Don't automatically deduce the lib path from the environment or MSVC
+      // installations when operating in mingw mode. (This also makes LLD ignore
+      // winsysroot and vctoolsdir arguments.)
+      detectWinSysRoot(args);
+      if (!args.hasArg(OPT_lldignoreenv) && !args.hasArg(OPT_winsysroot))
+        addLibSearchPaths();
+    } else {
+      if (args.hasArg(OPT_vctoolsdir, OPT_winsysroot))
+        warn("ignoring /vctoolsdir or /winsysroot flags in MinGW mode");
+    }
   }
 
   // Handle /ignore
diff --git a/lld/test/COFF/winsysroot.test b/lld/test/COFF/winsysroot.test
--- a/lld/test/COFF/winsysroot.test
+++ b/lld/test/COFF/winsysroot.test
@@ -49,5 +49,12 @@
 NO32: could not open 'std32.lib'
 
 Check that when /winsysroot is specified, %LIB% is ignored.
-# RUN: env LIB=foo.dir/sysroot/VC/Tools/MSVC/1.1.1.1/lib/x86 not lld-link %t.obj /winsysroot:%t.dir/doesnotexist /defaultlib:std32 2>&1 | FileCheck -check-prefix=LIBIGNORED %s
+# RUN: env LIB=%t.dir/sysroot/VC/Tools/MSVC/1.1.1.1/lib/x86 not lld-link %t.obj /winsysroot:%t.dir/doesnotexist /defaultlib:std32 2>&1 | FileCheck -check-prefix=LIBIGNORED %s
 LIBIGNORED: could not open 'std32.lib'
+
+Check that when -lldmingw is specified, %LIB% is ignored.
+# RUN: env LIB=%t.dir/sysroot/VC/Tools/MSVC/1.1.1.1/lib/x86 not lld-link -lldmingw %t.obj /defaultlib:std32 2>&1 | FileCheck -check-prefix=LIBIGNORED_MINGW %s
+LIBIGNORED_MINGW: could not open 'libstd32.a'
+
+# RUN: not lld-link -lldmingw %t.obj /defaultlib:std32 /winsysroot:%t.dir/sysroot 2>&1 | FileCheck -check-prefix=IGNORED_ARG %s
+IGNORED_ARG: warning: ignoring /vctoolsdir or /winsysroot flags in MinGW mode