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 $(TOPDIR)/include/pre req-build.mk prereq 2>/dev/null || {
echo "Prerequisite check failed. Use FORCE=1 to override." ;
#80; @+$(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