Utilities/Release/WiX/options.wxs

<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
    <Fragment>
        <!-- Hold the "CMAKE_IN_PATH" checkbox value in a public property to propagate to the InstallExecuteSequence. -->
        <Property Id="CMAKE_IN_PATH" Value="Init" />

        <!-- Always initialize the checkbox value so it cannot be directly overridden from the command line.  -->
        <SetProperty Action="Set_CMAKE_IN_PATH_Init"       Id="CMAKE_IN_PATH" After="AppSearch"                    Sequence="first" Value="1" />

        <!-- Read the "CMAKE_IN_PATH" checkbox value from the registry, if it was stored previously.
             Properties using RegistrySearch cannot be private, so use a private-looking public name. -->
        <Property Id="_CMAKE_IN_PATH_REG">
            <RegistrySearch Id="CMAKE_IN_PATH_RegistrySearch_HKLM" Root="HKLM" Key="Software\Kitware\CMake" Name="InstallInPATH" Type="raw" />
        </Property>

        <!-- Override the default "CMAKE_IN_PATH" checkbox with a value read from the registry, if any.  -->
        <SetProperty Action="Set_CMAKE_IN_PATH_REG_0"      Id="CMAKE_IN_PATH" After="Set_CMAKE_IN_PATH_Init"       Sequence="first" Value="{}"> _CMAKE_IN_PATH_REG = "#0"                    </SetProperty>
        <SetProperty Action="Set_CMAKE_IN_PATH_REG_1"      Id="CMAKE_IN_PATH" After="Set_CMAKE_IN_PATH_REG_0"      Sequence="first" Value="1">  _CMAKE_IN_PATH_REG = "#1"                    </SetProperty>

        <!-- Override the default "CMAKE_IN_PATH" checkbox with a value specified on the command line, if any.  -->
        <SetProperty Action="Set_CMAKE_IN_PATH_CMD_0"      Id="CMAKE_IN_PATH" After="Set_CMAKE_IN_PATH_REG_1"      Sequence="first" Value="{}">  ADD_CMAKE_TO_PATH = "0"                     </SetProperty>
        <SetProperty Action="Set_CMAKE_IN_PATH_CMD_1"      Id="CMAKE_IN_PATH" After="Set_CMAKE_IN_PATH_CMD_0"      Sequence="first" Value="1">   ADD_CMAKE_TO_PATH = "1"                     </SetProperty>
        <!-- Support legacy values too.  -->
        <SetProperty Action="Set_CMAKE_IN_PATH_CMD_None"   Id="CMAKE_IN_PATH" After="Set_CMAKE_IN_PATH_CMD_1"      Sequence="first" Value="{}">  ADD_CMAKE_TO_PATH = "None"                  </SetProperty>
        <SetProperty Action="Set_CMAKE_IN_PATH_CMD_System" Id="CMAKE_IN_PATH" After="Set_CMAKE_IN_PATH_CMD_None"   Sequence="first" Value="1">   ADD_CMAKE_TO_PATH = "System" AND ALLUSERS   </SetProperty>
        <!-- Per-user installation is not implemented, but reserve the old value for future use.  -->
        <SetProperty Action="Set_CMAKE_IN_PATH_CMD_User"   Id="CMAKE_IN_PATH" After="Set_CMAKE_IN_PATH_CMD_System" Sequence="first" Value="1">   ADD_CMAKE_TO_PATH = "User" AND NOT ALLUSERS </SetProperty>

        <DirectoryRef Id="TARGETDIR">
            <!-- Save the "CMAKE_IN_PATH" checkbox value persistently in the registry.  -->
            <Component Id="CMakeRegistry_InstallInPATH">
                <!-- Use a leading "0" so the value parses as an integer even when the property is unset.  -->
                <RegistryValue Root="HKLM" Key="Software\Kitware\CMake" Name="InstallInPATH" Type="integer" Value="0[CMAKE_IN_PATH]" />
            </Component>
        </DirectoryRef>
    </Fragment>
</Wix>