Index: include/llvm/Support/Host.h
===================================================================
--- include/llvm/Support/Host.h
+++ include/llvm/Support/Host.h
@@ -18,6 +18,8 @@
 
 #if defined(__linux__) || defined(__GNU__)
 #include <endian.h>
+#elif defined(_AIX)
+#include <sys/machine.h>
 #else
 #if !defined(BYTE_ORDER) && !defined(LLVM_ON_WIN32)
 #include <machine/endian.h>
Index: lib/Support/Unix/Path.inc
===================================================================
--- lib/Support/Unix/Path.inc
+++ lib/Support/Unix/Path.inc
@@ -67,7 +67,8 @@
 namespace fs {
 #if defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
     defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__) || \
-    defined(__linux__) || defined(__CYGWIN__) || defined(__DragonFly__)
+    defined(__linux__) || defined(__CYGWIN__) || defined(__DragonFly__)|| \
+    defined(_AIX)
 static int
 test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
 {  
@@ -138,7 +139,7 @@
   }
 #elif defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
       defined(__OpenBSD__) || defined(__minix) || defined(__DragonFly__) || \
-      defined(__FreeBSD_kernel__)
+      defined(__FreeBSD_kernel__) || defined(_AIX)
   char exe_path[PATH_MAX];
 
   if (getprogpath(exe_path, argv0) != NULL)