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diff -ur astropy-0.3.2/astropy/wcs/setup_package.py astropy-0.3.2.wcslib/astropy/wcs/setup_package.py
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--- astropy-0.3.2/astropy/wcs/setup_package.py	2014-05-21 11:19:24.260042437 +0200
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+++ astropy-0.3.2.wcslib/astropy/wcs/setup_package.py	2014-05-21 11:20:53.103770423 +0200
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@@ -309,10 +309,11 @@
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         'wcsmath.h',
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         'wcsprintf.h',
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         ]
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-    for header in wcslib_headers:
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-        shutil.copy(join('cextern', 'wcslib', 'C', header),
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+    if not setup_helpers.use_system_library('wcslib'):
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+        for header in wcslib_headers:
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+            shutil.copy(join('cextern', 'wcslib', 'C', header),
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                     join('astropy', 'wcs', 'include', 'wcslib', header))
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-        api_files.append(join('include', 'wcslib', header))
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+            api_files.append(join('include', 'wcslib', header))
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     return {
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         str('astropy.wcs.tests'): ['data/*.hdr', 'data/*.fits',