Linux:
    * install dependencies via distribution's package manager
        - i.e. with Ubuntu 18.04; "$ sudo apt install zlib1g-dev liblzma-dev libbz2-dev"
    
    * Build IFW

macOS:
    * install missing dependencies, i.e. with homebrew
        - "$ brew install libiconv xz"
    
    * Append env:
        export LIBRARY_PATH="/usr/local/lib:$LIBRARY_PATH"
        export C_INCLUDE_PATH="/usr/local/include:$C_INCLUDE_PATH"
        export CPLUS_INCLUDE_PATH="/usr/local/include:$CPLUS_INCLUDE_PATH"

        export LIBRARY_PATH="/usr/local/opt/libiconv/lib:$LIBRARY_PATH"
        export C_INCLUDE_PATH="/usr/local/opt/libiconv/include:$C_INCLUDE_PATH"
        export CPLUS_INCLUDE_PATH="/usr/local/opt/libiconv/include:$CPLUS_INCLUDE_PATH"

    * Build IFW
    
Win:
    * Get sources:
        https://tukaani.org/xz/
        https://zlib.net/
        https://www.sourceware.org/bzip2/

    * Build bzip2:
        - makefile.msc: replace "CFLAGS=..." -> "CFLAGS= -DWIN32 -MT -Ox -D_FILE_OFFSET_BITS=64 -nologo"
        - nmake -f path/to/makefile

    * Build zlib:
        - ./win32/makefile.msc: replace "CFLAGS=..." -> "CFLAGS= -nologo -MT -W3 -O2 -Oy- -Zi -Fd"zlib" $(LOC)"
        - nmake -f path/to/makefile

    * Build liblzma
        - copy "./windows/vs2017" -> "./windows/vs2015"
        - "./windows/vs2015/liblzma.vcxproj": replace in each "<PlatformToolset>v141</PlatformToolset>" -> "v140"
        - msbuild /property:Configuration=ReleaseMT path/to/proj

    * Append env variables (example prefix "C:\GNU\"):
        set INCLUDE=%INCLUDE%;C:\GNU\bzip2;C:\GNU\zlib;C:\GNU\xz\src\liblzma\api
        set LIB=%LIB%;C:\GNU\bzip2;C:\GNU\zlib;C:\GNU\xz\windows\vs2015\ReleaseMT\X64\liblzma

    * Build IFW