Gcc linking

[SpyrosMourelatos]

A known issue on gcc is that linker parameters should be last ,so change your makefile to :
g++ --std=c++11 -o we *.cpp -lboost_system -lboost_filesystem

what kind of gcc you have?

[SkyEmie]

I advise to use https://github.com/TheRioMiner/Wallpaper-Engine-Pkg-to-Zip Instead, it can read PKGV0002 PKG new file format version :)