diff --git a/SPECS/gcc.spec b/SPECS/gcc.spec
index 6404a41..0d6af00 100644
--- a/SPECS/gcc.spec
+++ b/SPECS/gcc.spec
@@ -170,6 +170,11 @@ URL: http://gcc.gnu.org
 # Need binutils which support -plugin
 # Need binutils which support .loc view >= 2.30
 # Need binutils which support --generate-missing-build-notes=yes >= 2.31
+
+# GCC requires clang/llvm? Ok.
+Buildrequires: /usr/bin/clang++
+Buildrequires: /usr/bin/llvm-config
+
 %if 0%{?fedora} >= 29 || 0%{?rhel} > 7
 BuildRequires: binutils >= 2.31
 %else