Works fine for me, tested using:

sudo dnf config-manager --set-enable updates-testing

# test primesieve command-line application
sudo dnf install primesieve
primesieve --test

# test primesieve C/C++ library
sudo dnf install primesieve-devel
wget https://raw.githubusercontent.com/kimwalisch/primesieve/master/examples/cpp/count_primes.cpp
g++ -O3 -Wall -Wextra -pedantic count_primes.cpp -o count_primes -lprimesieve
./count_primes

Works fine for me, tested using:

sudo dnf config-manager --set-enable updates-testing

# test primesieve command-line application
sudo dnf install primesieve
primesieve --test

# test primesieve C/C++ library
sudo dnf install primesieve-devel
wget https://raw.githubusercontent.com/kimwalisch/primesieve/master/examples/cpp/count_primes.cpp
g++ -O3 -Wall -Wextra -pedantic count_primes.cpp -o count_primes -lprimesieve
./count_primes

Works fine for me, tested using:

sudo dnf config-manager --set-enable updates-testing

# test primesieve command-line application
sudo dnf install primesieve
primesieve --test

# test primesieve C/C++ library
sudo dnf install gcc-c++ primesieve-devel
wget https://raw.githubusercontent.com/kimwalisch/primesieve/master/examples/cpp/count_primes.cpp
g++ -O3 -Wall -Wextra -pedantic count_primes.cpp -o count_primes -lprimesieve
./count_primes

Works fine for me, tested using:

sudo dnf config-manager --set-enable updates-testing

# test primesieve command-line application
sudo dnf install primesieve
primesieve --test

# test primesieve C/C++ library
sudo dnf install primesieve-devel
wget https://raw.githubusercontent.com/kimwalisch/primesieve/master/examples/cpp/count_primes.cpp
g++ -O3 -Wall -Wextra -pedantic count_primes.cpp -o count_primes -lprimesieve
./count_primes