Cannot find htmlhelp.h in cvs source (2011-2011-02-21) for MinGW build

[Tatsuro M. <tma...@ya...>]

Hello

I have trying new build system for windows help in chm style.
I have met following error.

gcc -shared-libgcc -c -I/home/gnuplotcvs/gnuplot/src -I/c/Programs/gpnewlib/include -O3 -I.. -I.
-D_Windows -DHAVE_CONFIG_H -DPIPES -DWGP_CONSOLE -DUSE_MOUSE=1 -DWIN_IPC -DWITH_HTML_HELP
-I/c/rogra~1/HTML\ Help\ Workshop/include -DHAVE_LIBGD -DHAVE_LIBPNG -DHAVE_GD_GIF -DGIF_ANIMATION
-DHAVE_GD_PNG -DHAVE_GD_JPEG -DHAVE_GD_TTF -DHAVE_CAIROPDF -DWXWIDGETS -DHAVE_LUA command.c
command.c:134:25: fatal error: htmlhelp.h: No such file or directory
compilation terminated.

I have searched htmlhelp.h by windows explorer but I cannot find it.
Where can I find htmlhelp.h?

Regards

Tatsuro