diff -up c-ares-1.17.0/include/CMakeLists.txt.ares_dns c-ares-1.17.0/include/CMakeLists.txt
--- c-ares-1.17.0/include/CMakeLists.txt.ares_dns	2020-11-17 10:52:31.669935103 -0500
+++ c-ares-1.17.0/include/CMakeLists.txt	2020-11-17 10:52:42.507979110 -0500
@@ -3,6 +3,6 @@ CONFIGURE_FILE (ares_build.h.cmake ${PRO
 
 # Headers installation target
 IF (CARES_INSTALL)
-	SET (CARES_HEADERS ares.h ares_version.h "${PROJECT_BINARY_DIR}/ares_build.h" ares_rules.h)
+	SET (CARES_HEADERS ares.h ares_version.h "${PROJECT_BINARY_DIR}/ares_build.h" ares_rules.h ../src/lib/ares_dns.h)
 	INSTALL (FILES ${CARES_HEADERS} COMPONENT Devel DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 ENDIF ()