What to do if asm/errno.h asm/ioctls.h and others are not found anymore in Ubuntu or Debian

It turns out you need to now install gcc-multilib. It's not clear why yet. A bug is already filed, but he maintainers seem to see no problem in suddenly changing this behavior...


Another workaround btw is to go into /usr/include and link to your generic header files:
sudo ln -fs ../src/linux/include/asm-generic .
sudo ln -fs ../src/linux/include/asm-generic asm

But I wouldn't recommend that. It may break later and cause you much more trouble. ;)

Btw. for Google: All these files could be affected and not found:

4level-fixup.h        atomic64.h            atomic.h             atomic-long.h   audit_change_attr.h  audit_dir_write.h    audit_read.h     audit_signal.h  audit_write.h
auxvec.h              bitops/               bitops.h             bitsperlong.h   bug.h                bugs.h               cacheflush.h     cache.h         checksum.h
cmpxchg.h             cmpxchg-local.h       cputime.h            current.h       delay.h              device.h             div64.h          dma-coherent.h  dma.h
dma-mapping-broken.h  dma-mapping-common.h  emergency-restart.h  errno-base.h    errno.h              fb.h                 fcntl.h          futex.h         getorder.h
gpio.h                hardirq.h             hw_irq.h             ide_iops.h      int-l64.h            int-ll64.h           ioctl.h          ioctls.h        io.h
iomap.h               ipcbuf.h              irqflags.h           irq.h           irq_regs.h           Kbuild               Kbuild.asm       kdebug.h        kmap_types.h
libata-portmap.h      linkage.h             local.h              memory_model.h  mman-common.h        mman.h               mm_hooks.h       mmu_context.h   mmu.h
module.h              msgbuf.h              mutex-dec.h          mutex.h         mutex-null.h         mutex-xchg.h         page.h           param.h         parport.h
pci-dma-compat.h      pci.h                 percpu.h             pgalloc.h       pgtable.h            pgtable-nopmd.h      pgtable-nopud.h  poll.h          posix_types.h
resource.h            rtc.h                 scatterlist.h        sections.h      segment.h            sembuf.h             serial.h         setup.h         shmbuf.h
shmparam.h            siginfo.h             signal-defs.h        signal.h        socket.h             sockios.h            spinlock.h       statfs.h        stat.h
string.h              swab.h                syscall.h            syscalls.h      system.h             termbits.h           termios-base.h   termios.h       timex.h
tlbflush.h            tlb.h                 topology.h           types.h         uaccess.h            uaccess-unaligned.h  ucontext.h       unaligned.h     unistd.h
user.h                vga.h                 vmlinux.lds.h        xor.h

In any case, you miss /usr/include/ asm  or asm-generic or both.

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