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-rw-r--r--t/interop/README7
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diff --git a/t/interop/README b/t/interop/README
index 72d42bd856..4e0608f857 100644
--- a/t/interop/README
+++ b/t/interop/README
@@ -83,3 +83,10 @@ You can then use test_expect_success as usual, with a few differences:
should create one with the appropriate version of git.
At the end of the script, call test_done as usual.
+
+Some older versions may need a few build knobs tweaked (e.g., ancient
+versions of Git no longer build with modern OpenSSL). Your script can
+set MAKE_OPTS_A and MAKE_OPTS_B, which will be passed alongside
+GIT_INTEROP_MAKE_OPTS. Users can override them per-script by setting
+GIT_INTEROP_MAKE_OPTS_{A,B} in the environment, just like they can set
+GIT_TEST_VERSION_{A,B}.