Fix variable substitution in Makefile syntax

diff --git a/debian/rules b/debian/rules
index d9ec2fbeeb589528a250bb3fc0fb24a80194b196..e4184276b4df1590f0b173a47da05c6cdf4f91f6 100755 (executable)
--- a/debian/rules
+++ b/debian/rules
@@ -248,7 +248,7 @@ override_dh_gencontrol:
          echo 'F:OCamlABI=$(OCAML_ABI)' >> debian/$$u.substvars; \
        done
 ifeq (,$(OCAML_OPT_ARCH))
-       echo 'F:BestProvides=ocaml-best-compilers (= ${binary:Version})' >> debian/ocaml-nox.substvars
+       echo 'F:BestProvides=ocaml-best-compilers (= $${binary:Version})' >> debian/ocaml-nox.substvars
 else
        echo 'F:BestProvides=' >> debian/ocaml-nox.substvars
 endif