Hi @cas thanks for the reply, i've changed my patch version to 2.7.5 but still the error

$make -j1 V=s
...
Build dependency: Please install GNU 'patch'

Prerequisite check failed. Use FORCE=1 to override.
make[2]: *** [/home/prac/Omega2_src_official/source/include/toplevel.mk:153: staging_dir/host/.prereq-build] Error 1
make[1]: *** [/home/prac/Omega2_src_official/source/include/toplevel.mk:80: prepare-tmpinfo] Error 2
make: *** [/home/prac/Omega2_src_official/source/include/toplevel.mk:198: world] Error 2

I think there is a problem with my toplevel.mk
#153 : @$(_SINGLE)$(NO_TRACE_MAKE) -j1 -r -s -f $(TOPDIR)/include/pre req-build.mk prereq 2>/dev/null || {
echo "Prerequisite check failed. Use FORCE=1 to override." ;
false;
#80; @+$(MAKE) -r -s staging_dir/host/.prereq-build $(PREP_MK)
#198: @+$(PREP_MK) $(NO_TRACE_MAKE) -r -s prereq]

it is a little weird though, because in the repository of https://github.com/WereCatf/source.git i don't have this error, instead i've a Download fail errors

SHELL= flock /home/prac/Omega2_src/source/tmp/.sed-4.4.tar.xz.flock -c ' /home/prac/Omega2_src/source/scripts/download.pl "/home/prac/Omega2_src/source/dl" "sed-4.4.tar.xz" "cbd6ebc5aaf080ed60d0162d7f6aeae58211a1ee9ba9bb25623daa6cd942683b" "" "@GNU/sed" '

• curl -f --connect-timeout 20 --retry 5 --location --insecure https://mirror.csclub.uwaterloo.ca/gnu/sed/sed-4.4.tar.xz

Download failed.

• curl -f --connect-timeout 20 --retry 5 --location --insecure https://mirror.netcologne.de/gnu/sed/sed-4.4.tar.xz

Download failed.

• curl -f --connect-timeout 20 --retry 5 --location --insecure http://ftp.kddilabs.jp/GNU/gnu/sed/sed-4.4.tar.xz

Download failed.

• curl -f --connect-timeout 20 --retry 5 --location --insecure http://www.nic.funet.fi/pub/gnu/gnu/sed/sed-4.4.tar.xz

Download failed.

• curl -f --connect-timeout 20 --retry 5 --location --insecure http://mirror.internode.on.net/pub/gnu/sed/sed-4.4.tar.xz

Download failed.

• curl -f --connect-timeout 20 --retry 5 --location --insecure http://mirror.navercorp.com/gnu/sed/sed-4.4.tar.xz

...
Download failed.
No more mirrors to try - giving up.
make[3]: *** [Makefile:46: /home/prac/Omega2_src/source/dl/sed-4.4.tar.xz] Error 2
make[3]: Leaving directory '/home/prac/Omega2_src/source/tools/sed'
make[2]: *** [tools/Makefile:150: tools/sed/compile] Error 2
make[2]: Leaving directory '/home/prac/Omega2_src/source'
make[1]: *** [tools/Makefile:146: /home/prac/Omega2_src/source/staging_dir/target-mips_24kc_musl/stamp/.tools_compile_yyyyyyyyynyyyyynyynnyyyyyyyyyyyyyyyyyyyynyynynyyyynny] Error 2
make[1]: Leaving directory '/home/prac/Omega2_src/source'
make: *** [/home/prac/Omega2_src/source/include/toplevel.mk:209: world] Error 2

I'm not sure why, but i'm keep looking... as i said before the weird think is that i didn't get stuck in the third party repo with the prereq script...
git log of the official repo i'm using
HEAD -> lede-17.01, origin/lede-17.01, origin/HEAD

Thanks for the reply @Douglas-Kryder.
I've already installed the GNU patch app

$patch -v
GNU patch 2.7
Copyright (C) 2003, 2009-2012 Free Software Foundation, Inc.
Copyright (C) 1988 Larry Wall

License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Larry Wall and Paul Eggert

But I get the same error...
BR,

Hi everyone I'm trying to do a Cross Compilation, and my current host is running a fedora 26 release, i've cloned the official repository https://github.com/OnionIoT/source.git and when i tried to
$make menuconfig
i get a make error:

Checking 'working-make'... ok.
Checking 'case-sensitive-fs'... ok.
Checking 'proper-umask'... ok.
Checking 'gcc'... ok.
Checking 'working-gcc'... ok.
Checking 'g++'... ok.
Checking 'working-g++'... ok.
Checking 'ncurses'... ok.
Checking 'zlib'... ok.
Checking 'perl-thread-queue'... ok.
Checking 'tar'... ok.
Checking 'find'... ok.
Checking 'bash'... ok.
Checking 'patch'... failed.
Checking 'diff'... ok.
Checking 'cp'... ok.
Checking 'seq'... ok.
Checking 'awk'... ok.
Checking 'grep'... ok.
Checking 'getopt'... ok.
Checking 'stat'... ok.
Checking 'unzip'... ok.
Checking 'bzip2'... ok.
Checking 'wget'... ok.
Checking 'perl'... ok.
Checking 'python'... ok.
Checking 'git'... ok.
Checking 'file'... ok.
Checking 'ldconfig-stub'... ok.

Build dependency: Please install GNU 'patch'

Prerequisite check failed. Use FORCE=1 to override.
make: *** [/home/prac/Omega2_src_official/source/include/toplevel.mk:153: staging_dir/host/.prereq-build] Error 1

I don't know what is the GNU patch that the script is looking for...
Does anyone knows what is the patch that it is required ?
Does anyone knows where is the prereq script source? maybe if could read the script source i can figure out what is this GNU patch...
Tahnkyou!

@Yasin-KARABULAK Thanks!

hey @luz you said I've done an application-specific mainboard (with a WS2812 LED output and RS485 interface) i'm wondering if you made some kind of modification in the serial driver to handle flow control with RS485,
BR,