$NetBSD: patch-src_CMakeLists.txt,v 1.1 2021/09/21 14:44:49 ryoon Exp $

* If /usr/include/sys/timerfd.h exists, do not install timerfd.h.

--- src/CMakeLists.txt.orig	2021-04-18 19:28:52.000000000 +0000
+++ src/CMakeLists.txt
@@ -31,6 +31,7 @@ endmacro()
 include(CheckSymbolExists)
 # FreeBSD 13 supports native eventfd descriptors. Prefer them if available.
 check_symbol_exists(eventfd "sys/eventfd.h" HAVE_EVENTFD)
+check_symbol_exists(timerfd_create "sys/timerfd.h" HAVE_TIMERFD)
 check_symbol_exists(kqueue1 "sys/event.h" HAVE_KQUEUE1)
 add_compat_target(kqueue1 "NOT;HAVE_KQUEUE1")
 check_symbol_exists(sigandset "signal.h" HAVE_SIGANDSET)
@@ -65,7 +66,6 @@ add_library(
   epoll.c
   epollfd_ctx.c
   kqueue_event.c
-  timerfd.c
   timerfd_ctx.c
   signalfd.c
   signalfd_ctx.c
@@ -73,6 +73,9 @@ add_library(
 if(NOT HAVE_EVENTFD)
   target_sources(epoll-shim PRIVATE eventfd.c eventfd_ctx.c)
 endif()
+if(NOT HAVE_TIMERFD)
+  target_sources(epoll-shim PRIVATE timerfd.c)
+endif()
 include(GenerateExportHeader)
 generate_export_header(epoll-shim BASE_NAME epoll_shim)
 target_link_libraries(
@@ -91,11 +94,13 @@ set(_headers
     "epoll-shim/detail/read.h"
     "epoll-shim/detail/write.h"
     "sys/epoll.h"
-    "sys/signalfd.h"
-    "sys/timerfd.h")
+    "sys/signalfd.h")
 if(NOT HAVE_EVENTFD)
   list(APPEND _headers "sys/eventfd.h")
 endif()
+if(NOT HAVE_TIMERFD)
+  list(APPEND _headers "sys/timerfd.h")
+endif()
 foreach(_header IN LISTS _headers)
   configure_file("${PROJECT_SOURCE_DIR}/include/${_header}"
                  "${PROJECT_BINARY_DIR}/install-include/${_header}" COPYONLY)