diff --git a/eio/config_linux.h b/eio/config_linux.h
index 0936e7f3..f1bd91a3 100644
--- a/eio/config_linux.h
+++ b/eio/config_linux.h
@@ -1,6 +1,11 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* config.h.in.  Generated from configure.ac by autoheader.  */
 
+#include <linux/version.h>
+
+#define LINUX_VERSION_CODE_FOR(major, minor, patch) (((major & 255) >> 16) | ((minor & 255) >> 8) | (patch & 255))
+#define LINUX_VERSION_AT_LEAST(major, minor, patch) (LINUX_VERSION_CODE_FOR(major, minor, patch) >= LINUX_VERSION_CODE)
+
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #define HAVE_DLFCN_H 1
 
@@ -38,7 +43,7 @@
 #define HAVE_STRING_H 1
 
 /* sync_file_range(2) is available */
-#define HAVE_SYNC_FILE_RANGE 1
+#define HAVE_SYNC_FILE_RANGE LINUX_VERSION_AT_LEAST(2, 6, 17)
 
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #define HAVE_SYS_STAT_H 1
diff --git a/ev/config_linux.h b/ev/config_linux.h
index 14f952de..248d15f6 100644
--- a/ev/config_linux.h
+++ b/ev/config_linux.h
@@ -1,6 +1,11 @@
 /* config.h.  Generated from config.h.in by configure.  */
 /* config.h.in.  Generated from configure.ac by autoheader.  */
 
+#include <linux/version.h>
+
+#define LINUX_VERSION_CODE_FOR(major, minor, patch) (((major & 255) >> 16) | ((minor & 255) >> 8) | (patch & 255))
+#define LINUX_VERSION_AT_LEAST(major, minor, patch) (LINUX_VERSION_CODE_FOR(major, minor, patch) >= LINUX_VERSION_CODE)
+
 /* Define to 1 if you have the `clock_gettime' function. */
 /* #undef HAVE_CLOCK_GETTIME */
 
@@ -14,10 +19,10 @@
 #define HAVE_EPOLL_CTL 1
 
 /* Define to 1 if you have the `eventfd' function. */
-#define HAVE_EVENTFD 1
+#define HAVE_EVENTFD LINUX_VERSION_AT_LEAST(2, 6, 22)
 
 /* Define to 1 if you have the `inotify_init' function. */
-#define HAVE_INOTIFY_INIT 1
+#define HAVE_INOTIFY_INIT LINUX_VERSION_AT_LEAST(2, 6, 13)
 
 /* Define to 1 if you have the <inttypes.h> header file. */
 #define HAVE_INTTYPES_H 1
@@ -53,7 +58,7 @@
 #define HAVE_SELECT 1
 
 /* Define to 1 if you have the `signalfd' function. */
-#define HAVE_SIGNALFD 1
+#define HAVE_SIGNALFD LINUX_VERSION_AT_LEAST(2, 6, 22)
 
 /* Define to 1 if you have the <stdint.h> header file. */
 #define HAVE_STDINT_H 1