Makefile: added new Makefile target 'compat' and first compatibility …

…patches

For now 'compat' is not integrated into the standard 'make' build process,
so you have to call it separately via 'make compat'.

The first compatibility patches substitute two bash expression that were
introduced in bash4, so that bee is compatible to systems with bash prior
version 4.

Makefile

@@ -49,6 +49,10 @@ sed-rules = -e 's,@PREFIX@,${PREFIX},g' \
 	    -e 's,@BEE_VERSION@,${BEE_VERSION},g' \
 	    -e 's,@DATADIR@,${DATADIR},g'
 
+sed-compat-bashlt4 = -e 'sx\$${\([a-zA-Z_]*\),,}x\$$(tr A-Z a-z <<<\$${\1})xg' \
+                     -e 'sx\$${\([a-zA-Z_]*\)^^}x\$$(tr a-z A-Z <<<\$${\1})xg'
+
+
 PROGRAMS_C=beeversion beesep beecut beeuniq beesort beegetopt
 PROGRAMS_SHELL=bee beesh
 PROGRAMS_PERL=beefind.pl
@@ -68,12 +72,20 @@ BEE_MANPAGES=bee.1 bee-check.1 bee-init.1 bee-install.1 bee-list.1 bee-query.1 b
 CONFIG_TEMPLATES=fallback
 CONFIG_FILES=skiplist beerc
 
+COMPAT_BASHLT4=buildtypes/autogen.sh buildtypes/configure.sh buildtypes/make.sh \
+               src/beesh.sh.in src/bee-check.sh.in
+
 .SUFFIXES: .in .sh .sh.in .pl
 
 all: build
 
 build: shellscripts perlscripts cprograms manpages
 
+compat: compat-bashlt4
+
+compat-bashlt4:
+	$(call quiet-command, sed ${sed-compat-bashlt4} -i ${COMPAT_BASHLT4}, "SED	$@" )
+
 SHELLSCRIPTS=$(PROGRAMS_SHELL) $(HELPER_BEE_SHELL)
 
 BEEVERSION_OBJECTS=beeversion.o bee_version_parse.o bee_version_compare.o bee_version_output.o