https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89066
--- Comment #3 from Matthew Wuensche <icypawn at aol dot com> --- I ran the online installer... and received this file mingw-w64-install.exe. And I reran the file to make sure all of those files were added. I found cc1 and added that path before submitting my "bug" report. PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;"C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static";"C:\Program Files (x86)\Common Files\lenovo\easyplussdk\bin";C:\WINDOWS\System32\OpenSSH\;C:\Users\auser\AppData\Local\Microsoft\WindowsApps;"C:\Program Files (x86)\mingw-w64\i686-8.1.0-win32-sjlj-rt_v6-rev0\mingw32\bin";"C:\Program Files (x86)\mingw-w64\i686-8.1.0-win32-sjlj-rt_v6-rev0\mingw32\libexec\gcc\i686-w64-mingw32\8.1.0" see the last path? That's where cc1.exe is. :)