Added dependency check and empty installer file :3

README.md

@@ -1,2 +1,15 @@
 # TylkoLinux
 TylkoLinux, an LFS system
+
+## Status
+LFS v12.2-systemd book chapter: 2.2.
+
+## To do
+```md
+[ ] Make a package manager
+[X] Finish the project in the first place
+```
+
+## Contributing
+I don't know what else to type lol just open a PR when this project is done
+### What would also help is to report any security vulnerability and/or bugs found on https://www.linuxfromscratch.org/lfs/errata/12.2-systemd/ in the Issues tab

version-check.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+# A script to list version numbers of critical development tools
+
+# If you have tools installed in other directories, adjust PATH here AND
+# in ~lfs/.bashrc (section 4.4) as well.
+
+LC_ALL=C 
+PATH=/usr/bin:/bin
+
+bail() { echo "FATAL: $1"; exit 1; }
+grep --version > /dev/null 2> /dev/null || bail "grep does not work"
+sed '' /dev/null || bail "sed does not work"
+sort   /dev/null || bail "sort does not work"
+
+ver_check()
+{
+   if ! type -p $2 &>/dev/null
+   then 
+     echo "ERROR: Cannot find $2 ($1)"; return 1; 
+   fi
+   v=$($2 --version 2>&1 | grep -E -o '[0-9]+\.[0-9\.]+[a-z]*' | head -n1)
+   if printf '%s\n' $3 $v | sort --version-sort --check &>/dev/null
+   then 
+     printf "OK:    %-9s %-6s >= $3\n" "$1" "$v"; return 0;
+   else 
+     printf "ERROR: %-9s is TOO OLD ($3 or later required)\n" "$1"; 
+     return 1; 
+   fi
+}
+
+ver_kernel()
+{
+   kver=$(uname -r | grep -E -o '^[0-9\.]+')
+   if printf '%s\n' $1 $kver | sort --version-sort --check &>/dev/null
+   then 
+     printf "OK:    Linux Kernel $kver >= $1\n"; return 0;
+   else 
+     printf "ERROR: Linux Kernel ($kver) is TOO OLD ($1 or later required)\n" "$kver"; 
+     return 1; 
+   fi
+}
+
+# Coreutils first because --version-sort needs Coreutils >= 7.0
+ver_check Coreutils      sort     8.1 || bail "Coreutils too old, stop"
+ver_check Bash           bash     3.2
+ver_check Binutils       ld       2.13.1
+ver_check Bison          bison    2.7
+ver_check Diffutils      diff     2.8.1
+ver_check Findutils      find     4.2.31
+ver_check Gawk           gawk     4.0.1
+ver_check GCC            gcc      5.2
+ver_check "GCC (C++)"    g++      5.2
+ver_check Grep           grep     2.5.1a
+ver_check Gzip           gzip     1.3.12
+ver_check M4             m4       1.4.10
+ver_check Make           make     4.0
+ver_check Patch          patch    2.5.4
+ver_check Perl           perl     5.8.8
+ver_check Python         python3  3.4
+ver_check Sed            sed      4.1.5
+ver_check Tar            tar      1.22
+ver_check Texinfo        texi2any 5.0
+ver_check Xz             xz       5.0.0
+ver_kernel 4.19
+
+if mount | grep -q 'devpts on /dev/pts' && [ -e /dev/ptmx ]
+then echo "OK:    Linux Kernel supports UNIX 98 PTY";
+else echo "ERROR: Linux Kernel does NOT support UNIX 98 PTY"; fi
+
+alias_check() {
+   if $1 --version 2>&1 | grep -qi $2
+   then printf "OK:    %-4s is $2\n" "$1";
+   else printf "ERROR: %-4s is NOT $2\n" "$1"; fi
+}
+echo "Aliases:"
+alias_check awk GNU
+alias_check yacc Bison
+alias_check sh Bash
+
+echo "Compiler check:"
+if printf "int main(){}" | g++ -x c++ -
+then echo "OK:    g++ works";
+else echo "ERROR: g++ does NOT work"; fi
+rm -f a.out
+
+if [ "$(nproc)" = "" ]; then
+   echo "ERROR: nproc is not available or it produces empty output"
+else
+   echo "OK: nproc reports $(nproc) logical cores are available"
+fi