On Linux, check for sys/eventfd.h with autoconf as well.

CMakeLists.txt

@@ -386,6 +386,10 @@ main(void)
         # linux/if_bonding.h requires sys/socket.h.
         #
         check_include_files("sys/socket.h;linux/if_bonding.h" HAVE_LINUX_IF_BONDING_H)
+
+        #
+        # Check for the eventfd header.
+        #
         check_include_files("sys/eventfd.h" HAVE_SYS_EVENTFD_H)
     endif()
 endif(NOT WIN32)

config.h.in

@@ -238,6 +238,9 @@
 /* Define to 1 if you have the <sys/dlpi.h> header file. */
 #undef HAVE_SYS_DLPI_H
 
+/* Define to 1 if you have the <sys/eventfd.h> header file. */
+#undef HAVE_SYS_EVENTFD_H
+
 /* Define to 1 if you have the <sys/ioccom.h> header file. */
 #undef HAVE_SYS_IOCCOM_H
 

configure

@@ -4931,6 +4931,9 @@ fi
 
 case "$host_os" in
 linux*|uclinux*)
+	#
+	# linux/if_bonding.h requires sys/socket.h.
+	#
 	for ac_header in linux/sockios.h linux/if_bonding.h
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
@@ -4946,6 +4949,22 @@ _ACEOF
 
 fi
 
+done
+
+
+	#
+	# Check for the eventfd header.
+	#
+	for ac_header in sys/eventfd.h
+do :
+  ac_fn_c_check_header_mongrel "$LINENO" "sys/eventfd.h" "ac_cv_header_sys_eventfd_h" "$ac_includes_default"
+if test "x$ac_cv_header_sys_eventfd_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_SYS_EVENTFD_H 1
+_ACEOF
+
+fi
+
 done
 
 	;;

configure.ac

@@ -73,11 +73,19 @@ fi
 
 case "$host_os" in
 linux*|uclinux*)
+	#
+	# linux/if_bonding.h requires sys/socket.h.
+	#
 	AC_CHECK_HEADERS(linux/sockios.h linux/if_bonding.h,,,
 	[
 #include <sys/socket.h>
 #include <linux/if.h>
 	])
+
+	#
+	# Check for the eventfd header.
+	#
+	AC_CHECK_HEADERS(sys/eventfd.h)
 	;;
 esac