sed: character class syntax is [[:space:]], not [:space:]

[lolbinarycat]

I got this error like 20 times when running make linux without kernel headers

full output

Copying /home/binarycat/compat/ files...
Updated from local tree: /home/binarycat/linux-next
Origin remote URL: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
This is a linux-next.git compat-drivers release

Base tree: linux-next.git
Base tree version: next-20200417
compat.git: compat-2013-03-28-4
compat-drivers release: compat-drivers-2013-03-28-5
Code metrics archive: http://bit.ly/H6BTF7
Copying compat/ ...
Copying include/ ...
Copying udev/ ...
Copying scripts/check_config.sh ...
Copying scripts/check_depmod ...
Copying scripts/compress_modules ...
Copying scripts/gen-compat-autoconf.sh ...
Copying scripts/modlib.sh ...
Copying scripts/update-initramfs ...
Copying scripts/skip-colors ...
Copying .compat_base ...
Copying .compat_base_tree ...
Copying .compat_base_tree_version ...
Copying .compat_version ...
Copying config.mk ...
Copying patches/unified-drivers/network/0001-backport-alx.patch ...

Synched with compat-drivers-2013-03-28-5
patching file alx_main.c
Hunk #8 FAILED at 2628.
Hunk #10 succeeded at 2824 with fuzz 1.
1 out of 10 hunks FAILED -- saving rejects to file alx_main.c.rej
make: [target/linux/port.mk:28: linux-backport] Error 1 (ignored)
make -C target/linux/
make[1]: Entering directory '/home/binarycat/alx/target/linux'
./scripts/gen-compat-autoconf.sh /home/binarycat/alx/target/linux/.config /home/binarycat/alx/target/linux/config.mk > include/linux/compat_autoconf.h
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
sed: character class syntax is [[:space:]], not [:space:]
make -C /lib/modules/4.19.0-8-amd64/build M=/home/binarycat/alx/target/linux modules
make[2]: Entering directory '/home/binarycat/alx/target/linux'
make[2]: *** /lib/modules/4.19.0-8-amd64/build: No such file or directory.  Stop.
make[2]: Leaving directory '/home/binarycat/alx/target/linux'
make[1]: *** [Makefile:72: linux] Error 2
make[1]: Leaving directory '/home/binarycat/alx/target/linux'
make: *** [target/linux/port.mk:36: linux] Error 2