The following issue has been SUBMITTED. 
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http://www.cmake.org/Bug/view.php?id=15154 
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Reported By:                Clinton Stimpson
Assigned To:                
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Project:                    CMake
Issue ID:                   15154
Category:                   CMake
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             2014-09-12 12:23 EDT
Last Modified:              2014-09-12 12:23 EDT
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Summary:                    Ninja complains about missing rule
Description: 
With the attached example project, Ninja will complain with an error saying 
"ninja: error: 'lib/libmylib.a', needed by 'myapp', missing and no known rule to
make it"

I'm using ExternalProject_Add() and then using imported library targets.
I then set the imported target to depend on the ExternalProject to make sure it
is up to date.

This works fine with Visual Studio, NMake, Make, Xcode, etc....

Steps to Reproduce: 
See attached project.
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Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2014-09-12 12:23 Clinton StimpsonNew Issue                                    
2014-09-12 12:23 Clinton StimpsonFile Added: test-ninja-external-build.tar.gz   
                
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