Can not build example

I clone repo, enter the example dir and try to build in NixOS unstable

❯ nix-build default.nix
these derivations will be built:
  /nix/store/3q1d0dfii70zcgp50a85bfxwniy6q8yb-Inline-Perl5.drv
  /nix/store/q6xzgkna0wh1bbgzng1dq6yd5ax3i0cj-Raku-Nix-Example.drv
building '/nix/store/3q1d0dfii70zcgp50a85bfxwniy6q8yb-Inline-Perl5.drv'...
unpacking sources
unpacking source archive /nix/store/j5h8g6cjm93srfh61n1a18mzypjp1yns-Inline-Perl5-0.44.tar.gz
source root is Inline-Perl5-0.44
setting SOURCE_DATE_EPOCH to timestamp 1580555921 of file Inline-Perl5-0.44/META6.json
preInstallPhase
installing
Failed to open file /build/Inline-Perl5-0.44/resources/libraries/libp5helper.so: No such file or directory
  in sub MAIN at /nix/store/p4251fgf69dvlih20cjfmaph9l6rkhms-install.p6 line 6
  in block <unit> at /nix/store/p4251fgf69dvlih20cjfmaph9l6rkhms-install.p6 line 1

builder for '/nix/store/3q1d0dfii70zcgp50a85bfxwniy6q8yb-Inline-Perl5.drv' failed with exit code 1
cannot build derivation '/nix/store/q6xzgkna0wh1bbgzng1dq6yd5ax3i0cj-Raku-Nix-Example.drv': 1 dependencies couldn't be built
error: build of '/nix/store/q6xzgkna0wh1bbgzng1dq6yd5ax3i0cj-Raku-Nix-Example.drv' failed
 
~/raku-nix/example on master !1 ?2                                                                                                  
❯