Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
cxxtools-devel
cxxtools-devel(x86-64)
pkgconfig(cxxtools)
pkgconfig(cxxtools-bin)
pkgconfig(cxxtools-http)
pkgconfig(cxxtools-json)
pkgconfig(cxxtools-unit)
pkgconfig(cxxtools-xmlrpc)

Requires :

/usr/bin/pkg-config
cxxtools(x86-64) = 1:3.0-14.fc42
libc.so.6()(64bit)
libc.so.6(GLIBC_2.14)(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.3)(64bit)
libc.so.6(GLIBC_2.32)(64bit)
libc.so.6(GLIBC_2.34)(64bit)
libc.so.6(GLIBC_2.4)(64bit)
libc.so.6(GLIBC_ABI_DT_RELR)(64bit)
libcxxtools-bin.so.10()(64bit)
libcxxtools-http.so.10()(64bit)
libcxxtools-json.so.10()(64bit)
libcxxtools-unit.so.10()(64bit)
libcxxtools-xmlrpc.so.10()(64bit)
libcxxtools.so.10()(64bit)
libgcc_s.so.1()(64bit)
libgcc_s.so.1(GCC_3.0)(64bit)
libgcc_s.so.1(GCC_3.3.1)(64bit)
libstdc++.so.6()(64bit)
libstdc++.so.6(CXXABI_1.3)(64bit)
libstdc++.so.6(CXXABI_1.3.8)(64bit)
libstdc++.so.6(CXXABI_1.3.9)(64bit)
libstdc++.so.6(GLIBCXX_3.4)(64bit)
libstdc++.so.6(GLIBCXX_3.4.11)(64bit)
libstdc++.so.6(GLIBCXX_3.4.21)(64bit)
libstdc++.so.6(GLIBCXX_3.4.32)(64bit)
libstdc++.so.6(GLIBCXX_3.4.7)(64bit)
libstdc++.so.6(GLIBCXX_3.4.9)(64bit)
pkgconfig(cxxtools)
pkgconfig(cxxtools-http)
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsZstd) <= 5.4.18-1
rtld(GNU_HASH)

Content of RPM :
/usr/bin/cxxtools-config
/usr/bin/cxxtz
/usr/bin/siconvert
/usr/include/cxxtools
/usr/include/cxxtools/application.h
/usr/include/cxxtools/arg.h
/usr/include/cxxtools/argin.h
/usr/include/cxxtools/argout.h
/usr/include/cxxtools/base64codec.h
/usr/include/cxxtools/base64stream.h
/usr/include/cxxtools/bin
/usr/include/cxxtools/bin/bin.h
/usr/include/cxxtools/bin/deserializer.h
/usr/include/cxxtools/bin/formatter.h
/usr/include/cxxtools/bin/parser.h
/usr/include/cxxtools/bin/rpcclient.h
/usr/include/cxxtools/bin/rpcserver.h
/usr/include/cxxtools/bin/serializer.h
/usr/include/cxxtools/byteorder.h
/usr/include/cxxtools/cache.h
/usr/include/cxxtools/callable.h
/usr/include/cxxtools/callable.tpp
/usr/include/cxxtools/cgi.h
/usr/include/cxxtools/char.h
/usr/include/cxxtools/charmapcodec.h
/usr/include/cxxtools/clock.h
/usr/include/cxxtools/composer.h
/usr/include/cxxtools/condition.h
/usr/include/cxxtools/config.h
/usr/include/cxxtools/connectable.h
There is 237 files more in these RPM.