2.40 does not build on older kernels

[satmandu]

The lsfd build fails due to missing kernel bfd headers, for instance, if kernel 3.8 headers are used.

Could a meson option to bypass the build of lsfd be added?

[satmandu]

This was insufficient to fix this:

      diff -Npaur a/meson.build b/meson.build
      --- a/meson.build	2024-03-28 23:37:49.623330230 -0400
      +++ b/meson.build	2024-03-28 23:39:08.982615866 -0400
      @@ -2703,6 +2703,7 @@ endif
       mq_libs = []
       mq_libs += cc.find_library('rt', required : true)

      +opt = not get_option('build-lsfd').disabled()
       exe = executable(
         'lsfd',
         lsfd_sources,
      @@ -2712,7 +2713,7 @@ exe = executable(
         dependencies : mq_libs,
         install_dir : usrbin_exec_dir,
         install : true)
      -if not is_disabler(exe)
      +if opt and not is_disabler(exe)
         exes += exe
         manadocs += ['misc-utils/lsfd.1.adoc']
       endif
      diff -Npaur a/meson_options.txt b/meson_options.txt
      --- a/meson_options.txt	2024-03-28 23:39:28.782438124 -0400
      +++ b/meson_options.txt	2024-03-28 23:40:38.789810977 -0400
      @@ -53,6 +53,8 @@ option('build-fdisks', type : 'feature',
              description : 'build fdisk(8), sfdisk(8) and cfdisk(8)')
       option('build-mount', type : 'feature',
              description : 'build mount(8) and umount(8)')
      +option('build-lsfd', type : 'feature',
      +       description : 'build lsfd')
       option('build-losetup', type : 'feature',
              description : 'build losetup')
       option('build-zramctl', type : 'feature',

[jwillikers]

The lsfd dependency also pulls in lib rt as a required dependency, which prevents building libuuid on macOS.

[jwillikers]

@satmandu Can you try with #2879?

[satmandu]

@satmandu Can you try with #2879?

That lets me fix the build. Thanks!