my $libdir = `llvm-config --libdir`;
chomp $libdir;
-my $LibProfPath = $libdir . "/profile_rt.so";
+my $LibProfPath = $libdir . "/libprofile_rt.so";
system "opt -q -f $ProfilePass $BytecodeFile -o $BytecodeFile.inst";
system "lli -fake-argv0 '$BytecodeFile' -load $LibProfPath " .