diff --git a/clang.spec b/clang.spec
index c30184f..e948ed7 100644
--- a/clang.spec
+++ b/clang.spec
@@ -184,6 +184,10 @@ BuildRequires: perl(Term::ANSIColor)
 BuildRequires: perl(Text::ParseWords)
 BuildRequires: perl(Sys::Hostname)
 
+%if %{with pgo_instrumented_build}
+BuildRequires: compiler-rt
+%endif
+
 Requires:	%{name}-libs%{?_isa} = %{version}-%{release}
 
 # clang requires gcc, clang++ requires libstdc++-devel
@@ -428,6 +432,12 @@ sed -i 's/\@FEDORA_LLVM_LIB_SUFFIX\@//g' test/lit.cfg.py
 %ifarch %{arm}
 	-DCLANG_DEFAULT_LINKER=lld \
 %endif
+%if %{with pgo_instrumented_build}
+	-DLLVM_BUILD_INSTRUMENTED=IR \
+	-DLLVM_BUILD_RUNTIME=No \
+	-DCMAKE_C_COMPILER=/usr/bin/clang \
+	-DCMAKE_CXX_COMPILER=/usr/bin/clang++ \
+%endif
 	-DCLANG_DEFAULT_UNWINDLIB=libgcc
 
 %cmake_build