verbiage about "make check"
diff --git a/README b/README
index 0949267..ec29dac 100644
--- a/README
+++ b/README
@@ -78,7 +78,10 @@
Better documentation for these will be forthcoming, but in
general, this should work:
-./configure && make && make install
+./configure && make && make check && make install
+
+The 'make check' step is optional; omit it to skip all the tests,
+which can take several hours.
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