diff --git a/lib/CodeGen/InstrSelection/InstrForest.cpp b/lib/CodeGen/InstrSelection/InstrForest.cpp
index c33faec..5afa1da 100644
--- a/lib/CodeGen/InstrSelection/InstrForest.cpp
+++ b/lib/CodeGen/InstrSelection/InstrForest.cpp
@@ -21,7 +21,7 @@
 #include "llvm/Type.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "Support/STLExtras.h"
-#include <alloca.h>
+#include "Support/Alloca.h"
 using std::cerr;
 using std::vector;
 
diff --git a/lib/Support/SystemUtils.cpp b/lib/Support/SystemUtils.cpp
index 034c141f..c88a516 100644
--- a/lib/Support/SystemUtils.cpp
+++ b/lib/Support/SystemUtils.cpp
@@ -10,7 +10,7 @@
 #include <fstream>
 #include <iostream>
 #include <cstdlib>
-#include <alloca.h>
+#include "Support/Alloca.h"
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
diff --git a/lib/Target/SparcV9/InstrSelection/InstrForest.cpp b/lib/Target/SparcV9/InstrSelection/InstrForest.cpp
index c33faec..5afa1da 100644
--- a/lib/Target/SparcV9/InstrSelection/InstrForest.cpp
+++ b/lib/Target/SparcV9/InstrSelection/InstrForest.cpp
@@ -21,7 +21,7 @@
 #include "llvm/Type.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "Support/STLExtras.h"
-#include <alloca.h>
+#include "Support/Alloca.h"
 using std::cerr;
 using std::vector;
 
diff --git a/lib/Target/X86/X86CodeEmitter.cpp b/lib/Target/X86/X86CodeEmitter.cpp
index 45d0b8c..bfb4aaa 100644
--- a/lib/Target/X86/X86CodeEmitter.cpp
+++ b/lib/Target/X86/X86CodeEmitter.cpp
@@ -13,7 +13,7 @@
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/Value.h"
 #include "Support/Statistic.h"
-#include <alloca.h>
+#include "Support/Alloca.h"
 
 namespace {
   Statistic<>