--- ceph-12.2.13/src/rgw/CMakeLists.txt.orig	2020-01-30 21:52:36.000000000 +0100
+++ ceph-12.2.13/src/rgw/CMakeLists.txt	2020-05-28 21:27:33.099627687 +0200
@@ -135,6 +135,7 @@
 
 
 if (WITH_RADOSGW_FCGI_FRONTEND)
+  include_directories(SYSTEM ${FCGI_INCLUDE_DIR})
   list(APPEND rgw_a_srcs rgw_fcgi.cc)
 endif()
 
--- ceph-12.2.13/src/test/CMakeLists.txt.orig	2020-01-30 21:52:36.000000000 +0100
+++ ceph-12.2.13/src/test/CMakeLists.txt	2020-05-28 22:29:50.639379697 +0200
@@ -352,6 +352,9 @@
   )
 set_target_properties(ceph_test_librgw_file_marker PROPERTIES COMPILE_FLAGS
   ${UNITTEST_CXX_FLAGS})
+if(WITH_RADOSGW_FCGI_FRONTEND)
+target_include_directories(ceph_test_librgw_file_marker PRIVATE ${FCGI_INCLUDE_DIR})
+endif(WITH_RADOSGW_FCGI_FRONTEND)
 target_link_libraries(ceph_test_librgw_file_marker
   rgw
   librados