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

Provides :
clang-devel(major)
clang18-devel
clang18-devel(x86-64)

Requires :

clang18(x86-64) = 18.1.8-5.fc42
clang18-libs = 18.1.8-5.fc42
clang18-tools-extra(x86-64) = 18.1.8-5.fc42
ld-linux-x86-64.so.2()(64bit)
ld-linux-x86-64.so.2(GLIBC_2.3)(64bit)
libc.so.6()(64bit)
libc.so.6(GLIBC_2.14)(64bit)
libc.so.6(GLIBC_2.15)(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.3)(64bit)
libc.so.6(GLIBC_2.3.4)(64bit)
libc.so.6(GLIBC_2.32)(64bit)
libc.so.6(GLIBC_2.33)(64bit)
libc.so.6(GLIBC_2.34)(64bit)
libc.so.6(GLIBC_2.36)(64bit)
libc.so.6(GLIBC_2.38)(64bit)
libc.so.6(GLIBC_2.4)(64bit)
libc.so.6(GLIBC_ABI_DT_RELR)(64bit)
libclang-cpp.so.18.1()(64bit)
libclang.so.18.1()(64bit)
libgcc_s.so.1()(64bit)
libgcc_s.so.1(GCC_3.0)(64bit)
libgcc_s.so.1(GCC_3.3)(64bit)
libm.so.6()(64bit)
libm.so.6(GLIBC_2.2.5)(64bit)
libstdc++.so.6()(64bit)
libstdc++.so.6(CXXABI_1.3)(64bit)
libstdc++.so.6(CXXABI_1.3.11)(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_3.4.14)(64bit)
libstdc++.so.6(GLIBCXX_3.4.15)(64bit)
libstdc++.so.6(GLIBCXX_3.4.18)(64bit)
libstdc++.so.6(GLIBCXX_3.4.19)(64bit)
libstdc++.so.6(GLIBCXX_3.4.20)(64bit)
libstdc++.so.6(GLIBCXX_3.4.21)(64bit)
libstdc++.so.6(GLIBCXX_3.4.26)(64bit)
libstdc++.so.6(GLIBCXX_3.4.29)(64bit)
libstdc++.so.6(GLIBCXX_3.4.30)(64bit)
libstdc++.so.6(GLIBCXX_3.4.9)(64bit)
libtinfo.so.6()(64bit)
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/clang-tblgen-18
/usr/lib/.build-id
/usr/lib/.build-id/2e
/usr/lib/.build-id/2e/b93e8ab893f118a597158bfbb10d53aeae8262
/usr/lib64/llvm18/bin/clang-tblgen
/usr/lib64/llvm18/include/clang
/usr/lib64/llvm18/include/clang-c
/usr/lib64/llvm18/include/clang-c/BuildSystem.h
/usr/lib64/llvm18/include/clang-c/CXCompilationDatabase.h
/usr/lib64/llvm18/include/clang-c/CXDiagnostic.h
/usr/lib64/llvm18/include/clang-c/CXErrorCode.h
/usr/lib64/llvm18/include/clang-c/CXFile.h
/usr/lib64/llvm18/include/clang-c/CXSourceLocation.h
/usr/lib64/llvm18/include/clang-c/CXString.h
/usr/lib64/llvm18/include/clang-c/Documentation.h
/usr/lib64/llvm18/include/clang-c/ExternC.h
/usr/lib64/llvm18/include/clang-c/FatalErrorHandler.h
/usr/lib64/llvm18/include/clang-c/Index.h
/usr/lib64/llvm18/include/clang-c/Platform.h
/usr/lib64/llvm18/include/clang-c/Rewrite.h
/usr/lib64/llvm18/include/clang/APINotes
/usr/lib64/llvm18/include/clang/APINotes/APINotesManager.h
/usr/lib64/llvm18/include/clang/APINotes/APINotesOptions.h
/usr/lib64/llvm18/include/clang/APINotes/APINotesReader.h
/usr/lib64/llvm18/include/clang/APINotes/APINotesWriter.h
/usr/lib64/llvm18/include/clang/APINotes/APINotesYAMLCompiler.h
/usr/lib64/llvm18/include/clang/APINotes/Types.h
/usr/lib64/llvm18/include/clang/ARCMigrate
/usr/lib64/llvm18/include/clang/ARCMigrate/ARCMT.h
/usr/lib64/llvm18/include/clang/ARCMigrate/ARCMTActions.h
There is 794 files more in these RPM.