I fixed this by trying it on the command line and comparing my results. I unchecked a bunch of options in the incredibuild version and also point it to the dsw instead of the dsp.
<code>
<step action='Make VC6' type='1'>
<Attr type='11'>-1</Attr>
<Config>Win32 Release</Config>
<FileVer type='11'>-1</FileVer>
<Filename>%PWD%\Project.dsp</Filename>
<FixLibDep type='11'>-1</FixLibDep>
<Force type='11'>-1</Force>
<ShowCmd type='11'>-1</ShowCmd>
<condcompareto>Error</condcompareto>
<condcomparison type='3'>2</condcomparison>
<condexpr>%INCREDIBUILD%</condexpr>
<indent type='3'>2</indent>
<name>Build Release</name>
</step>
<step action='Make VC6' type='1'>
<Attr type='11'>0</Attr>
<Config>Win32 Release</Config>
<FileVer type='11'>-1</FileVer>
<Filename>%PWD%\Project.dsw</Filename>
<FixLibDep type='11'>0</FixLibDep>
<Location>%INCREDIBUILD%</Location>
<Options>%INCREDIBUILD_OPTIONS% /REBUILD</Options>
<ShowCmd type='11'>-1</ShowCmd>
<condcompareto>Error</condcompareto>
<condcomparison type='3'>5</condcomparison>
<condexpr>%INCREDIBUILD%</condexpr>
<indent type='3'>2</indent>
<name>IncrediBuild Release</name>
</step>
</code>