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-rwxr-xr-xmakediff.sh5
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diff --git a/makediff.sh b/makediff.sh
index 1960dbd..b3a3624 100755
--- a/makediff.sh
+++ b/makediff.sh
@@ -1,3 +1,8 @@
+#force revision and date in environment
+#this way they don't appear in the diff
+export SPECDOC=${SPECDOC:-`cat REVISION`}
+export DATESTR=${DATESTR:-`cat REVISION-DATE`}
+
#make pdf diff using latexpand and latexdiff-fast
#preamble in diffpreamble.tex
#in diff, links are coloured green instead of blue