:: Trailing semicolon in this variable as set by current (2017/01) :: conda-build breaks us. Manual fix: set "MSYS2_ARG_CONV_EXCL=/AI;/AL;/OUT;/out" :: Delegate to the Unixy script. We need to translate the key path variables :: to be Unix-y rather than Windows-y, though. set "saved_recipe_dir=%RECIPE_DIR%" FOR /F "delims=" %%i IN ('cygpath.exe -u -p "%PATH%"') DO set "PATH_OVERRIDE=%%i" FOR /F "delims=" %%i IN ('cygpath.exe -m "%BUILD_PREFIX%"') DO set "BUILD_PREFIX_M=%%i" FOR /F "delims=" %%i IN ('cygpath.exe -m "%LIBRARY_PREFIX%"') DO set "LIBRARY_PREFIX_M=%%i" FOR /F "delims=" %%i IN ('cygpath.exe -u "%LIBRARY_PREFIX%"') DO set "LIBRARY_PREFIX_U=%%i" FOR /F "delims=" %%i IN ('cygpath.exe -u "%PREFIX%"') DO set "PREFIX=%%i" FOR /F "delims=" %%i IN ('cygpath.exe -u "%PYTHON%"') DO set "PYTHON=%%i" FOR /F "delims=" %%i IN ('cygpath.exe -u "%RECIPE_DIR%"') DO set "RECIPE_DIR=%%i" FOR /F "delims=" %%i IN ('cygpath.exe -u "%SP_DIR%"') DO set "SP_DIR=%%i" FOR /F "delims=" %%i IN ('cygpath.exe -u "%SRC_DIR%"') DO set "SRC_DIR=%%i" FOR /F "delims=" %%i IN ('cygpath.exe -u "%STDLIB_DIR%"') DO set "STDLIB_DIR=%%i" bash -x %saved_recipe_dir%\build.sh if errorlevel 1 exit 1