Leif,
the message that ./configure --with-help produces is this:
Not present: libusb.so (64bit)
This package is needed only for installing libftdi for soft66.
For the Si570 (Softrock, IQ+, Fifi SDR and others) and USB2LPT
it is obsolete and libusb-1.0 is a replacement.
To install old libusb, use one of these commands:
Debian,Ubuntu: apt-get install libusb-dev
Modern Debian: ln -s /lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4
/lib/x86_64-linux-gnu/libusb.so
Old Fedora: yum install libusb-devel
Fedora 22 and later: dnf install libusb-devel
SuSE: zypper install libusb-compat-devel
Mageia: urpmi lib64usb-compat0.1-devel
PCLinuxOS: apt-get install lib64usb-compat0.1-devel
Sabayon: ln -s /lib64/libusb-0.1.so.4 /lib64/libusb.so
Then run ./configure --with-help again.
So apparently libusb-1.0 is not a replacement at least for my Debian version.
Can anyone compile Linrad with the new libusb?
ciao!
ps: I even tried to donwload the latest libusb 1.0 from the source and
compile it, but it's the same.