additional steps to compile on ubuntu bionic

[mailinglists35]

apt install libarchive-dev gcc-8
export CXX="g++-8" CC="gcc-8"
make

without these, you get:

In file included from src/unlocker.cpp:35:
include/archiveutils.h:6:10: fatal error: archive.h: No such file or directory
    6 | #include <archive.h>
      |          ^~~~~~~~~~~
compilation terminated.
<builtin>: recipe for target 'src/unlocker.o' failed
make: *** [src/unlocker.o] Error 1

and

g++ -Wall -std=c++17 -Iinclude   -c -o src/unlocker.o src/unlocker.cpp
src/unlocker.cpp:25:10: fatal error: filesystem: No such file or directory
 #include <filesystem>
          ^~~~~~~~~~~~
compilation terminated.
<builtin>: recipe for target 'src/unlocker.o' failed
make: *** [src/unlocker.o] Error 1

[paolo-projects]

the dependencies and compilation instructions are explained in the readme, namely here

The program needs the following libraries:

• libcurl
• zlib
• libarchive

and here

Linux: Use the embedded Makefile. Get needed libraries (or compile them and install) first, then run make

Note regarding default g++ version on Ubuntu: by default, Ubuntu ships with g++ v7, which doesn't support natively c++17 features. To compile the program you have to install at least g++-8, set CXX variable when running make and add stdc++fs library dependence (make CXX=g++-8 LIBS=-lstdc++fs)

Alternatively, you can install g++-9 and avoid adding the library dependency.