--- a/dev-libs/cereal/cereal-1.3.2-r1.ebuild	2022-03-18 19:10:03.000000000 +0200
+++ a/dev-libs/cereal/cereal-1.3.2-r1.ebuild	2022-03-25 15:55:09.131352947 +0200
@@ -25,6 +25,8 @@ 
 
 	# remove bundled rapidjson
 	rm -r include/cereal/external/rapidjson || die 'could not remove bundled rapidjson'
+	sed -i -e 's%^\(#include\) "cereal/external/\(rapidjson/[a-z]\+.h\)"%\1 <\2>%g' include/cereal/archives/json.hpp
+	sed -i -e 's%CEREAL_\(RAPIDJSON_NAMESPACE\)%\1%g' include/cereal/archives/json.hpp
 
 	cmake_src_prepare
 }