diff --git a/compiler/cpp/CMakeLists.txt b/compiler/cpp/CMakeLists.txt
index 5642d16..01e229d 100644
--- a/compiler/cpp/CMakeLists.txt
+++ b/compiler/cpp/CMakeLists.txt
@@ -19,10 +19,8 @@
 
 # Windows has a different header
 if(MSVC)
-    set(FLEX_FLAGS "--wincompat") # Don't use unistd.h on windows
     configure_file(${CMAKE_CURRENT_SOURCE_DIR}/src/windows/version.h.in ${CMAKE_CURRENT_BINARY_DIR}/version.h)
 else()
-    set(FLEX_FLAGS " ")
     configure_file(${CMAKE_CURRENT_SOURCE_DIR}/version.h.in ${CMAKE_CURRENT_BINARY_DIR}/version.h)
 endif()
 
@@ -31,7 +29,7 @@
 
 # Create flex and bison files and build the lib parse static library
 BISON_TARGET(thrifty ${CMAKE_CURRENT_SOURCE_DIR}/src/thrifty.yy ${CMAKE_CURRENT_BINARY_DIR}/thrifty.cc)
-FLEX_TARGET(thriftl ${CMAKE_CURRENT_SOURCE_DIR}/src/thriftl.ll ${CMAKE_CURRENT_BINARY_DIR}/thriftl.cc COMPILE_FLAGS ${FLEX_FLAGS})
+FLEX_TARGET(thriftl ${CMAKE_CURRENT_SOURCE_DIR}/src/thriftl.ll ${CMAKE_CURRENT_BINARY_DIR}/thriftl.cc)
 ADD_FLEX_BISON_DEPENDENCY(thriftl thrifty)
 
 # HACK: Work around the fact that bison crates a .hh file but we need a .h file
diff --git a/compiler/cpp/README.md b/compiler/cpp/README.md
index fdc6451..b4a159f 100644
--- a/compiler/cpp/README.md
+++ b/compiler/cpp/README.md
@@ -25,24 +25,27 @@
 
 ## Build on windows
 
-In order to build on windows a few additional steps are necessary:
+### using Git Bash
+Git Bash provides flex and bison, so you just need to do this:
+
+    mkdir build_vs && cd build_vs
+    cmake -DWITH_SHARED_LIB=off ..
+
+### using Win flex-bison
+
+In order to build on windows with winflexbison a few additional steps are necessary:
 
 1. Download winflexbison from http://sourceforge.net/projects/winflexbison/
 2. Extract the winflex bison files to for e.g. C:\winflexbison
 3. Make the CMake variables point to the correct binaries.
   * FLEX_EXECUTABLE = C:/winbuild/win_flex.exe
   * BISON_EXECUTABLE = C:/winbuild/win_bison.exe
-
-
-### Create a Visual Studio project
-
-    mkdir build_vs && cd build_vs
-    cmake -G "Visual Studio 12" ..
-
-Now open the folder build_vs using Visual Studio 2013.
-
-
-
+4. Generate a Visual Studio project:
+```
+mkdir build_vs && cd build_vs
+cmake -G "Visual Studio 12" -DWITH_SHARED_LIB=off ..
+```
+5. Now open the folder build_vs using Visual Studio 2013.
 
 # Building the Thrift IDL compiler in Windows
 
diff --git a/compiler/cpp/src/thriftl.ll b/compiler/cpp/src/thriftl.ll
index a8ffe57..11ba1b9 100644
--- a/compiler/cpp/src/thriftl.ll
+++ b/compiler/cpp/src/thriftl.ll
@@ -43,6 +43,8 @@
 #pragma warning(disable:4102)
 //avoid isatty redefinition
 #define YY_NEVER_INTERACTIVE 1
+
+#define YY_NO_UNISTD_H 1
 #endif
 
 #include <cassert>