diff --git a/lldb/cmake/modules/LLDBGenerateConfig.cmake b/lldb/cmake/modules/LLDBGenerateConfig.cmake
--- a/lldb/cmake/modules/LLDBGenerateConfig.cmake
+++ b/lldb/cmake/modules/LLDBGenerateConfig.cmake
@@ -12,6 +12,7 @@
 check_cxx_symbol_exists(accept4 "sys/socket.h" HAVE_ACCEPT4)
 
 check_include_file(termios.h HAVE_TERMIOS_H)
+check_include_file("sys/types.h" HAVE_SYS_TYPES_H)
 check_include_files("sys/types.h;sys/event.h" HAVE_SYS_EVENT_H)
 
 check_cxx_symbol_exists(process_vm_readv "sys/uio.h" HAVE_PROCESS_VM_READV)
diff --git a/lldb/include/lldb/Host/Config.h.cmake b/lldb/include/lldb/Host/Config.h.cmake
--- a/lldb/include/lldb/Host/Config.h.cmake
+++ b/lldb/include/lldb/Host/Config.h.cmake
@@ -19,6 +19,8 @@
 
 #define LLDB_LIBDIR_SUFFIX "${LLVM_LIBDIR_SUFFIX}"
 
+#cmakedefine01 HAVE_SYS_TYPES_H
+
 #cmakedefine01 HAVE_SYS_EVENT_H
 
 #cmakedefine01 HAVE_PPOLL
diff --git a/lldb/source/Expression/UserExpression.cpp b/lldb/source/Expression/UserExpression.cpp
--- a/lldb/source/Expression/UserExpression.cpp
+++ b/lldb/source/Expression/UserExpression.cpp
@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "lldb/Host/Config.h"
+
 #include <stdio.h>
 #if HAVE_SYS_TYPES_H
 #include <sys/types.h>
diff --git a/lldb/source/Expression/UtilityFunction.cpp b/lldb/source/Expression/UtilityFunction.cpp
--- a/lldb/source/Expression/UtilityFunction.cpp
+++ b/lldb/source/Expression/UtilityFunction.cpp
@@ -6,9 +6,13 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "lldb/Host/Config.h"
+
 #include <stdio.h>
 #if HAVE_SYS_TYPES_H
 #include <sys/types.h>
+#else
+static_assert(false, "");
 #endif
 
 
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangUserExpression.cpp
@@ -6,9 +6,13 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "lldb/Host/Config.h"
+
 #include <stdio.h>
 #if HAVE_SYS_TYPES_H
 #include <sys/types.h>
+#else
+static_assert(false, "");
 #endif
 
 #include <cstdlib>
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangUtilityFunction.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangUtilityFunction.cpp
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangUtilityFunction.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangUtilityFunction.cpp
@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "lldb/Host/Config.h"
+
 #include "ClangUtilityFunction.h"
 #include "ClangExpressionDeclMap.h"
 #include "ClangExpressionParser.h"
@@ -14,6 +16,8 @@
 #include <stdio.h>
 #if HAVE_SYS_TYPES_H
 #include <sys/types.h>
+#else
+static_assert(false, "");
 #endif
 
 
diff --git a/lldb/tools/driver/Platform.h b/lldb/tools/driver/Platform.h
--- a/lldb/tools/driver/Platform.h
+++ b/lldb/tools/driver/Platform.h
@@ -9,6 +9,8 @@
 #ifndef lldb_Platform_h_
 #define lldb_Platform_h_
 
+#include "lldb/Host/Config.h"
+
 #if defined(_WIN32)
 
 #include <io.h>