diff --git a/build.spec.inc b/build.spec.inc
index 13cc33b..784878c 100644
--- a/build.spec.inc
+++ b/build.spec.inc
@@ -1,5 +1,5 @@
 # TODO(kkleine): In clang we had this %ifarch s390 s390x aarch64 %ix86 ppc64le
-%ifarch s390 s390x %ix86
+%if 0%{?rhel} == 8
 # Decrease debuginfo verbosity to reduce memory consumption during final library linking
 %global optflags %(echo %{optflags} | sed 's/-g /-g1 /')
 %endif
@@ -113,7 +113,7 @@ cd llvm
 	-DLLVM_PARALLEL_LINK_JOBS=1 \
 	-DCMAKE_BUILD_TYPE=RelWithDebInfo \
 	-DCMAKE_SKIP_RPATH:BOOL=ON \
-%ifarch s390 %ix86
+%if 0%{?rhel} == 8
 	-DCMAKE_C_FLAGS_RELWITHDEBINFO="%{optflags} -DNDEBUG" \
 	-DCMAKE_CXX_FLAGS_RELWITHDEBINFO="%{optflags} -DNDEBUG" \
 %endif