Patch by Anibal Monsalve Salazar
 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=621934

Index: gdbm-1.8.3/Makefile.in
===================================================================
--- gdbm-1.8.3.orig/Makefile.in
+++ gdbm-1.8.3/Makefile.in
@@ -55,7 +55,7 @@ manext = 3
 .c.lo:
 	$(LIBTOOL) --mode=compile $(CC) -c $(CPPFLAGS) $(DEFS) -I. -I$(srcdir) $(CFLAGS) $<
 
-SHELL = /bin/sh
+SHELL = @SHELL@
 
 PROGS = libgdbm.la testgdbm testdbm testndbm tndbm tdbm conv2gdbm