You should install manpages-dev, which provides manpages for system calls and a number of library functions, and the -dev and (if any) -doc packages for the libraries you’re developing with.

For kernel functions you should install linux-manual-4.9 (or whichever version is appropriate); this is where you’ll find man 9 fls.

You should install manpages-dev, which provides manpages for system calls and a number of library functions, and the -dev and (if any) -doc packages for the libraries you’re developing with.

For kernel functions you should install linux-manual-4.9 (or whichever version is appropriate); this is where you’ll find man 9 fls.

To find manpages in general, install apt-file, update the indexes (apt update), then search for the manpage you want:

apt-file search -x man./fls\\.

(the -x option tells apt-file to interpret the argument as a Perl regex).

You should install manpages-dev, which provides manpages for system calls and a number of library functions, and the -dev and (if any) -doc packages for the libraries you’re developing with.

You should install manpages-dev, which provides manpages for system calls and a number of library functions, and the -dev and (if any) -doc packages for the libraries you’re developing with.

For kernel functions you should install linux-manual-4.9 (or whichever version is appropriate); this is where you’ll find man 9 fls.