Add SHELL to the list of variables in Makefile.in to make
it available to the Makefile.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
---

 Makefile.in |    1 +
 1 file changed, 1 insertion(+)

--- a/Makefile.in
+++ b/Makefile.in
@@ -18,6 +18,7 @@ twin_LDFLAGS = @twin_LIBS@
 
 # other programs
 INSTALL = @INSTALL@
+SHELL = @SHELL@
 
 # paths
 prefix = @prefix@

--