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      <base href="https://bugs.llvm.org/">
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    <body><span class="vcard"><a class="email" href="mailto:jdevlieghere@apple.com" title="Jonas Devlieghere <jdevlieghere@apple.com>"> <span class="fn">Jonas Devlieghere</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - Include guards missing for compression.h"
   href="https://bugs.llvm.org/show_bug.cgi?id=44690">bug 44690</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>RESOLVED
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>INVALID
           </td>
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            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - Include guards missing for compression.h"
   href="https://bugs.llvm.org/show_bug.cgi?id=44690#c1">Comment # 1</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - Include guards missing for compression.h"
   href="https://bugs.llvm.org/show_bug.cgi?id=44690">bug 44690</a>
              from <span class="vcard"><a class="email" href="mailto:jdevlieghere@apple.com" title="Jonas Devlieghere <jdevlieghere@apple.com>"> <span class="fn">Jonas Devlieghere</span></a>
</span></b>
        <pre>This code is in debugserver which is macOS-only. We always have libcompresion
there. Furthermore it entirely separate from the rest of LLDB and doesn't read
the header that defines HAVE_LIBCOMPRESSION. 

I don't think you want to build debugserver for NixOS. It should only be a
target on Darwin. See tools/CMakeLists.txt:

 13 if (CMAKE_SYSTEM_NAME MATCHES "Darwin")
 14   add_lldb_tool_subdirectory(darwin-debug)
 15   if(NOT LLDB_USE_SYSTEM_DEBUGSERVER)
 16     add_lldb_tool_subdirectory(debugserver)
 17   endif()
 18 endif()</pre>
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