diff --git a/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp b/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp
index ab4ddbfe1fb20..0ed2016667162 100644
--- a/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp
+++ b/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp
@@ -730,9 +730,19 @@ ConnectionStatus ConnectionFileDescriptor::ConnectFile(
     struct termios options;
     ::tcgetattr(fd, &options);
 
-    // Set port speed to maximum
+    // Set port speed to the available maximum
+#ifdef B115200
     ::cfsetospeed(&options, B115200);
     ::cfsetispeed(&options, B115200);
+#elif B57600
+    ::cfsetospeed(&options, B57600);
+    ::cfsetispeed(&options, B57600);
+#elif B38400
+    ::cfsetospeed(&options, B38400);
+    ::cfsetispeed(&options, B38400);
+#else
+#error "Maximum Baud rate is Unknown"
+#endif
 
     // Raw input, disable echo and signals
     options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
diff --git a/lldb/source/Plugins/Language/ObjC/Cocoa.cpp b/lldb/source/Plugins/Language/ObjC/Cocoa.cpp
index b35e27ad8123f..1d79edbede5d6 100644
--- a/lldb/source/Plugins/Language/ObjC/Cocoa.cpp
+++ b/lldb/source/Plugins/Language/ObjC/Cocoa.cpp
@@ -1226,7 +1226,7 @@ bool lldb_private::formatters::ObjCSELSummaryProvider(
 time_t lldb_private::formatters::GetOSXEpoch() {
   static time_t epoch = 0;
   if (!epoch) {
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(_AIX)
     tzset();
     tm tm_epoch;
     tm_epoch.tm_sec = 0;
diff --git a/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.cpp b/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.cpp
index 3835f2b08a05f..b202898ff438a 100644
--- a/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.cpp
+++ b/lldb/source/Plugins/ObjectContainer/BSD-Archive/ObjectContainerBSDArchive.cpp
@@ -8,7 +8,7 @@
 
 #include "ObjectContainerBSDArchive.h"
 
-#if defined(_WIN32) || defined(__ANDROID__)
+#if defined(_WIN32) || defined(__ANDROID__) || defined(_AIX)
 // Defines from ar, missing on Windows
 #define SARMAG 8
 #define ARFMAG "`\n"