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

Provides :
pjproject-devel
pjproject-devel(x86-64)
pkgconfig(libpjproject)

Requires :

pjproject = 2.3-6.el7
libpjnath.so.2()(64bit)
libpjlib-util.so.2()(64bit)
libpjsua2.so.2()(64bit)
libpjmedia.so.2()(64bit)
libpjsip.so.2()(64bit)
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
libpjmedia-videodev.so.2()(64bit)
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
libpjmedia-codec.so.2()(64bit)
libpj.so.2()(64bit)
libpjsip-simple.so.2()(64bit)
libpjsip-ua.so.2()(64bit)
/usr/bin/pkg-config
libpjsua.so.2()(64bit)
rpmlib(PayloadIsXz) <= 5.2-1
libpjmedia-audiodev.so.2()(64bit)
/sbin/ldconfig

Content of RPM :
/usr/include/pj
/usr/include/pj++
/usr/include/pj++/file.hpp
/usr/include/pj++/hash.hpp
/usr/include/pj++/list.hpp
/usr/include/pj++/lock.hpp
/usr/include/pj++/os.hpp
/usr/include/pj++/pool.hpp
/usr/include/pj++/proactor.hpp
/usr/include/pj++/scanner.hpp
/usr/include/pj++/sock.hpp
/usr/include/pj++/string.hpp
/usr/include/pj++/timer.hpp
/usr/include/pj++/tree.hpp
/usr/include/pj++/types.hpp
/usr/include/pj/activesock.h
/usr/include/pj/addr_resolv.h
/usr/include/pj/array.h
/usr/include/pj/assert.h
/usr/include/pj/compat
/usr/include/pj/compat/assert.h
/usr/include/pj/compat/cc_armcc.h
/usr/include/pj/compat/cc_codew.h
/usr/include/pj/compat/cc_gcc.h
/usr/include/pj/compat/cc_gcce.h
/usr/include/pj/compat/cc_msvc.h
/usr/include/pj/compat/cc_mwcc.h
/usr/include/pj/compat/ctype.h
/usr/include/pj/compat/errno.h
/usr/include/pj/compat/high_precision.h
There is 296 files more in these RPM.