Index: include/lldb/Host/Config.h
===================================================================
--- include/lldb/Host/Config.h
+++ include/lldb/Host/Config.h
@@ -25,6 +25,8 @@
 
 #define HAVE_SIGACTION 1
 
+#define HAVE_LIBCOMPRESSION 1
+
 #else
 
 #error This file is only used by the Xcode build.
Index: source/Plugins/Process/gdb-remote/GDBRemoteCommunication.h
===================================================================
--- source/Plugins/Process/gdb-remote/GDBRemoteCommunication.h
+++ source/Plugins/Process/gdb-remote/GDBRemoteCommunication.h
@@ -217,8 +217,10 @@
   HostThread m_listen_thread;
   std::string m_listen_url;
 
-  CompressionType m_decompression_scratch_type;
-  void *m_decompression_scratch;
+#if defined(HAVE_LIBCOMPRESSION)
+  CompressionType m_decompression_scratch_type = CompressionType::None;
+  void *m_decompression_scratch = nullptr;
+#endif
 
   DISALLOW_COPY_AND_ASSIGN(GDBRemoteCommunication);
 };
Index: source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp
===================================================================
--- source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp
+++ source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp
@@ -41,8 +41,7 @@
 #define DEBUGSERVER_BASENAME "lldb-server"
 #endif
 
-#if defined(__APPLE__)
-#define HAVE_LIBCOMPRESSION
+#if defined(HAVE_LIBCOMPRESSION)
 #include <compression.h>
 #endif
 
@@ -67,10 +66,7 @@
 #endif
       m_echo_number(0), m_supports_qEcho(eLazyBoolCalculate), m_history(512),
       m_send_acks(true), m_compression_type(CompressionType::None),
-      m_listen_url(), m_decompression_scratch_type(CompressionType::None),
-      m_decompression_scratch(nullptr) {
-  // Unused unless HAVE_LIBCOMPRESSION is defined.
-  (void)m_decompression_scratch_type;
+      m_listen_url() {
 }
 
 //----------------------------------------------------------------------
@@ -81,8 +77,10 @@
     Disconnect();
   }
 
+#if defined(HAVE_LIBCOMPRESSION)
   if (m_decompression_scratch)
     free (m_decompression_scratch);
+#endif
 
   // Stop the communications read thread which is used to parse all incoming
   // packets.  This function will block until the read thread returns.