stripping (with flags -S) in  /nix/store/5m8ycv6mlsglwp0ng66sa8mbvnyr2dsc-pgen/lib  /nix/store/5m8ycv6mlsglwp0ng66sa8mbvnyr2dsc-pgen/bin 
strip: /nix/store/5m8ycv6mlsglwp0ng66sa8mbvnyr2dsc-pgen/lib/pkgconfig/pgen.pc: File format not recognized
patching ELF executables and libraries
/nix/store/5m8ycv6mlsglwp0ng66sa8mbvnyr2dsc-pgen/bin/removevarsyntax
/nix/store/5m8ycv6mlsglwp0ng66sa8mbvnyr2dsc-pgen/bin/sdf2table
/nix/store/5m8ycv6mlsglwp0ng66sa8mbvnyr2dsc-pgen/bin/sdfchecker
patching script interpreter paths