1 files changed, 6 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index c44eb3a851..fdac1b9803 100644
--- a/Makefile
+++ b/Makefile
@@ -348,6 +348,8 @@ all::
 #
 # Define NO_HMAC_CTX_CLEANUP if your OpenSSL is version 0.9.6b or earlier to
 # cleanup the HMAC context with the older HMAC_cleanup function.
+#
+# Define HAVE_BSD_SYSCTL if your platform has a BSD-compatible sysctl function.
 
 GIT-VERSION-FILE: FORCE
 	@$(SHELL_PATH) ./GIT-VERSION-GEN
@@ -1414,6 +1416,10 @@ ifdef HAVE_CLOCK_MONOTONIC
 	BASIC_CFLAGS += -DHAVE_CLOCK_MONOTONIC
 endif
 
+ifdef HAVE_BSD_SYSCTL
+	BASIC_CFLAGS += -DHAVE_BSD_SYSCTL
+endif
+
 ifeq ($(TCLTK_PATH),)
 NO_TCLTK = NoThanks
 endif