Bison.exe I/O error building Qt5.2 on Windows

[pyl0420]

Hi:

I am doing a shadow build with Qt5.2 on Windows, but I got some bison.exe I/O error. Wondering whether anybody has seen similar issues or has any suggestion what might go wrong.

Thanks in advance.
-Y

Here is what I did:
@
unzip source to L:\qt-everywhere-enterprise-src-5.2.0
In VS2010 x64 command prompt
mkdir qt5_src_build
cd qt5_src_build
setup dependencies like python, icu, zlib
SET PATH=%PATH%;L:\qt-everywhere-enterprise-src-5.2.0\gnuwin32\bin
SET CL=/MP
@

[pyl0420]

@
L:\qt-everywhere-enterprise-src-5.2.0\configure -prefix L:\qt5_src_build -commercial -nomake tests -debug -confirm-license -opengl desktop
nmake
@

Here is the error I got
@
( if not exist Makefile.ANGLE.DerivedSources L:\qt5_src_build\qtbase\bin\qmake L:\qt-everywhere-enterprise-src-5.2.0\qtwebkit\Source
\ThirdParty\ANGLE\DerivedSources.pri -o Makefile.ANGLE.DerivedSources ) && "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\BIN\amd64
\nmake.exe" -f Makefile.ANGLE.DerivedSources

Microsoft (R) Program Maintenance Utility Version 10.00.30319.01
Copyright (C) Microsoft Corporation. All rights reserved.

    win_flex --noline --nounistd --outfile=generated\glslang_lex.cpp L:\qt-everywhere-enterprise-src-5.2.0\qtwebkit\Source\ThirdParty\AN

GLE\src\compiler\glslang.l
win_flex --noline --nounistd --outfile=generated\Tokenizer_lex.cpp L:\qt-everywhere-enterprise-src-5.2.0\qtwebkit\Source\ThirdParty
ANGLE\src\compiler\preprocessor\Tokenizer.l
bison --no-lines --skeleton=yacc.c --defines=generated\glslang_tab.h --output=generated\glslang_tab.cpp L:\qt-everywhere-enterprise-
src-5.2.0\qtwebkit\Source\ThirdParty\ANGLE\src\compiler\glslang.y
m4: Unknown option -I
Usage: m4 [-ps] [-Dname[=value]] [-Uname] [file ...]
L:\qt-everywhere-enterprise-src-5.2.0\gnuwin32\bin\bison.EXE: I/O error
NMAKE : fatal error U1077: 'L:\qt-everywhere-enterprise-src-5.2.0\gnuwin32\bin\bison.EXE' : return code '0x1'
Stop.
NMAKE : fatal error U1077: '(' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.
@

[pyl0420]

Looks like the problem is I have another version of m4 in my path. Put the "L:\qt-everywhere-enterprise-src-5.2.0\gnuwin32\bin" before all the system path will solve the problem