./configure --enable-capi for mISNDuser fails

Hi,

Today I got around to play with mISDN again (trying to build an answering/fax machine).
When I run "./configure --enable-capi" in the mISDNuser subdirectory I get the following error:

checking for capi20.h... yes
checking capi_mod.h usability... no
checking capi_mod.h presence... no
checking for capi_mod.h... no
configure: error: capi_mod.h do not exist - update capi4linux

I have pulled both mISDN and mISDNuser from git://git.misdn.eu/

Any suggestions what I have missed?
Answers in English and German are welcome (;-)

Regards,
-- 
Dan Johansson, <http://www.dmj.nu>
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