Error when I compile the program as the guidance about cpp-ipfs-http-client HOT 6 CLOSED

/tmp/cctPIZ8r.o: In function `main':
myprog.cc:(.text+0x4f): undefined reference to `ipfs::Client::Client(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, long)'
myprog.cc:(.text+0x78): undefined reference to `ipfs::Client::~Client()'
collect2: error: ld returned 1 exit status

~$ mkdir /tmp/ipfs
~$ cd /tmp/ipfs
/tmp/ipfs$ git clone https://github.com/vasild/cpp-ipfs-http-client.git
/tmp/ipfs$ git clone https://github.com/nlohmann/json.git
/tmp/ipfs$ mkdir build

# build static library

/tmp/ipfs$ cd build
/tmp/ipfs/build$ cmake -DCMAKE_INSTALL_PREFIX:PATH=/tmp/ipfs/install -DJSON_FOR_MODERN_CXX_INCLUDE_DIR:PATH=/tmp/ipfs/json/include ../cpp-ipfs-http-client
/tmp/ipfs/build$ make -j4
/tmp/ipfs/build$ make install
/tmp/ipfs/build$ ls -l /tmp/ipfs/install/lib/
-rw-r--r--  1 vd  vd     1803892 Mar 25 10:53 libipfs-http-client.a
/tmp/ipfs/build$ cd ..
/tmp/ipfs$ cat > myprog.cc <<EOF
> #include "ipfs/client.h"
>
> int main(int argc, char** argv) {
>   ipfs::Client a("localhost", 5001);
>   return 0;
> }
> EOF
/tmp/ipfs$ c++ -std=c++11 -I./json/include -I./install/include -L./install/lib -L/usr/local/lib -lipfs-http-client -lcurl myprog.cc -o myprog

# build shared library

/tmp/ipfs$ rm -fr build/* install
/tmp/ipfs$ cd build
/tmp/ipfs$ cmake -DCMAKE_INSTALL_PREFIX:PATH=/tmp/ipfs/install -DJSON_FOR_MODERN_CXX_INCLUDE_DIR:PATH=/tmp/ipfs/json/include -DBUILD_SHARED_LIBS:BOOL=ON ../cpp-ipfs-http-client
/tmp/ipfs$ make -j4
/tmp/ipfs$ make install
/tmp/ipfs/build$ ls -l /tmp/ipfs/install/lib/
lrwxr-xr-x  1 vd  vd           24 Mar 25 11:00 libipfs-http-client.so -> libipfs-http-client.so.0
lrwxr-xr-x  1 vd  vd           28 Mar 25 11:00 libipfs-http-client.so.0 -> libipfs-http-client.so.0.4.0
-rwxr-xr-x  1 vd  vd       986664 Mar 25 11:00 libipfs-http-client.so.0.4.0
/tmp/ipfs$ c++ -std=c++11 -I./json/include -I./install/include -L./install/lib -lipfs-http-client myprog.cc -o myprog