undefined reference to `hdt::HDTManager::mapHDT(char const*, hdt::ProgressListener*)'

[KonradHoeffner]

I followed the documentation exactly but I cannot compile any of the examples after installing the current dev branch:

./autogen.sh
./configure
make -j2
sudo make install
[...]
Libraries have been installed in:
   /usr/local/lib

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the '-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the 'LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the 'LD_RUN_PATH' environment variable
     during linking
   - use the '-Wl,-rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to '/etc/ld.so.conf'
[...]

I also added /usr/local/lib to a new file /etc/ld.so.conf.d/hdtcpp.conf and executed sudo ldconfig.

$ g++ -I/usr/local/include -L/usr/local/lib -Wl,-rpath -Wl,/usr/local/lib search.cpp
/usr/bin/ld: /tmp/ccy8i6RF.o: in function `main':
search.cpp:(.text+0x20): undefined reference to `hdt::HDTManager::mapHDT(char const*, hdt::ProgressListener*)'
collect2: error: ld returned 1 exit status

The code of search.cpp is taken from https://www.rdfhdt.org/manual-of-the-c-hdt-library/:

#include <iostream>
#include <HDTManager.hpp>
 
using namespace std;
using namespace hdt;
 
int main(int argc, char *argv[]) {
 
    // Load HDT file (Use mapIndexedHDT if you plan to use ?p?, ?po or ??o queries.
    HDT *hdt = HDTManager::mapHDT("data/test.hdt");
 
    // Enumerate all triples matching a pattern ("" means any)
    IteratorTripleString *it = hdt->search("http://example.org/uri3","","");
    while(it->hasNext()){
        TripleString *triple = it->next();
        cout << triple->getSubject() <<
        ", " << triple->getPredicate() <<
        ", " << triple->getObject() << endl;
    }
    delete it; // Remember to delete iterator to avoid memory leaks!
    delete hdt; // Remember to delete instance when no longer needed!
}

I am very inexperienced with C++ so this may be something basic that is not written in the docs that experienced C++ programmers know already.
In case this is not a bug, I would be very glad if you could explain the problem in terms that a beginner C++ programmer can understand.

The HDT libraries seem to exist in /usr/local/lib:

$ ls /usr/local/lib 
libcds.a  libcds.la  libcds.so  libcds.so.0  libcds.so.0.0.0  libhdt.a  libhdt.la  libhdt.so  libhdt.so.0  libhdt.so.0.0.0  pkgconfig

verbose

$ g++ -v -I/usr/local/include -L/usr/local/lib -Wl,-rpath -Wl,/usr/local/lib search.cpp
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --enable-bootstrap --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --with-build-config=bootstrap-lto --with-linker-hash-style=gnu --with-system-zlib --enable-__cxa_atexit --enable-cet=auto --enable-checking=release --enable-clocale=gnu --enable-default-pie --enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-object --enable-libstdcxx-backtrace --enable-link-serialization=1 --enable-linker-build-id --enable-lto --enable-multilib --enable-plugin --enable-shared --enable-threads=posix --disable-libssp --disable-libstdcxx-pch --disable-werror
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.0 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-I' '/usr/local/include' '-L/usr/local/lib' '-shared-libgcc' '-mtune=generic' '-march=x86-64' '-dumpdir' 'a-'
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/cc1plus -quiet -v -I /usr/local/include -D_GNU_SOURCE search.cpp -quiet -dumpdir a- -dumpbase search.cpp -dumpbase-ext .cpp -mtune=generic -march=x86-64 -version -o /tmp/ccm8ymhR.s
GNU C++17 (GCC) version 12.2.0 (x86_64-pc-linux-gnu)
	compiled by GNU C version 12.2.0, GMP version 6.2.1, MPFR version 4.1.0-p13, MPC version 1.2.1, isl version isl-0.25-GMP

warning: MPFR header version 4.1.0-p13 differs from library version 4.2.0.
warning: MPC header version 1.2.1 differs from library version 1.3.1.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../x86_64-pc-linux-gnu/include"
ignoring duplicate directory "/usr/local/include"
  as it is a non-system directory that duplicates a system directory
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/x86_64-pc-linux-gnu
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/backward
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/include
 /usr/local/include
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/include-fixed
 /usr/include
End of search list.
GNU C++17 (GCC) version 12.2.0 (x86_64-pc-linux-gnu)
	compiled by GNU C version 12.2.0, GMP version 6.2.1, MPFR version 4.1.0-p13, MPC version 1.2.1, isl version isl-0.25-GMP

warning: MPFR header version 4.1.0-p13 differs from library version 4.2.0.
warning: MPC header version 1.2.1 differs from library version 1.3.1.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 402ce889a414e2a3abbbe3146fa0a6cb
COLLECT_GCC_OPTIONS='-v' '-I' '/usr/local/include' '-L/usr/local/lib' '-shared-libgcc' '-mtune=generic' '-march=x86-64' '-dumpdir' 'a-'
 as -v -I /usr/local/include --64 -o /tmp/ccnaLg4i.o /tmp/ccm8ymhR.s
GNU assembler version 2.39.0 (x86_64-pc-linux-gnu) using BFD version (GNU Binutils) 2.39.0
COMPILER_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/:/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/:/usr/lib/gcc/x86_64-pc-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/:/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../lib/:/lib/../lib/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-I' '/usr/local/include' '-L/usr/local/lib' '-shared-libgcc' '-mtune=generic' '-march=x86-64' '-dumpdir' 'a.'
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/collect2 -plugin /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/liblto_plugin.so -plugin-opt=/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/lto-wrapper -plugin-opt=-fresolution=/tmp/cc952HXo.res -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc --build-id --eh-frame-hdr --hash-style=gnu -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -pie /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../lib/Scrt1.o /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../lib/crti.o /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/crtbeginS.o -L/usr/local/lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0 -L/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../lib -L/lib/../lib -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../.. -rpath /usr/local/lib /tmp/ccnaLg4i.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/crtendS.o /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../lib/crtn.o
/usr/bin/ld: /tmp/ccnaLg4i.o: in function `main':
search.cpp:(.text+0x20): undefined reference to `hdt::HDTManager::mapHDT(char const*, hdt::ProgressListener*)'
collect2: error: ld returned 1 exit status