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-rw-r--r--third_party/rules.mk3
1 files changed, 3 insertions, 0 deletions
diff --git a/third_party/rules.mk b/third_party/rules.mk
index 8fcdb76d6c..018f7cb432 100644
--- a/third_party/rules.mk
+++ b/third_party/rules.mk
@@ -8,8 +8,11 @@
#
# Build and link against libcryptoc.
+# See https://chromium.googlesource.com/chromiumos/third_party/cryptoc .
ifeq ($(CONFIG_LIBCRYPTOC),y)
+# The cryptoc path can be overridden on invocation, as in the following example:
+# $ make CRYPTOC_DIR=~/src/cryptoc BOARD=bloonchipper
CRYPTOC_DIR ?= $(realpath ../../third_party/cryptoc)
# SUPPORT_UNALIGNED indicates to libcryptoc that provided data buffers