Hello, this afternoon I have had the same trouble, after some time of searching I get the solution, so here is it: you have to install isdn4k-utils download from here(this are the last :S): ftp://ftp.isdn4linux.de/pub/isdn4linux/CVS-Snapshots/isdn4k-utils-CVS-2007-11-27.tar.bz2 after you uncompressing the file you have to enter in the directori and do: Code: $ make menuconfig save the settings Code: $ make here it gave me a compilation error in the line 80 of the /usr/include/linux/capi.h file. I searched again on the internet :S and again I find the solution. You have to delete the line 80 of the file and add one line that file (/usr/include/linux/capi.h)(make a backup first, who knows... what's going to happen): * we delete this line: "void __user *data;" * we add this line: void *data; so the result is this: Code: typedef struct capi_manufacturer_cmd { unsigned long cmd; void *data; run make again and then Code: # make install // # checkinstall (--fstrans=no for slackware) I have done all in Slackware 12.1 PD: sorry for my poor english :D