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-rw-r--r--src/Makefile2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/Makefile b/src/Makefile
index 03ee7c28b7..cea05871a8 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -516,6 +516,8 @@ CClink = $(CC)
# EFENCE - Electric-Fence malloc debugging: catches memory accesses beyond
# allocated memory (and makes every malloc()/free() very slow).
# Electric Fence is free (search ftp sites).
+# You may want to set the EF_PROTECT_BELOW environment variable to check the
+# other side of allocated memory.
# On FreeBSD you might need to enlarge the number of mmaps allowed. Do this
# as root: sysctl -w vm.max_proc_mmap=30000
#EXTRA_LIBS = /usr/local/lib/libefence.a