sed -r is a GNU extension, apparently, and due to stars aligning, this didn't…

sed -r is a GNU extension, apparently, and due to stars aligning, this didn't break the build, but led to a totally bogus soname on non-GNU systems. Argh.

Apparently most systems (including GNU, undocumentedly) support -E instead, but perhaps the safest thing is to use a basic regular expression. Unfortunately on many systems ? and + are not available in basic regexes, but using * instead happens to work in our case.

Thanks to @neverpanic for catching this.

Fixes #210

c++/Makefile.am

@@ -189,7 +189,7 @@ endif
 
 # Don't include security release in soname -- we want to replace old binaries
 # in this case.
-SO_VERSION = $(shell echo $(VERSION) | sed -re 's/^([0-9]+[.][0-9]+[.][0-9]+)([.][0-9]+)?(-.*)?$$/\1\3/g')
+SO_VERSION = $(shell echo $(VERSION) | sed -e 's/^\([0-9]*[.][0-9]*[.][0-9]*\)\([.][0-9]*\)*\(-.*\)*$$/\1\3/g')
 
 libkj_la_LIBADD = $(PTHREAD_LIBS)
 libkj_la_LDFLAGS = -release $(SO_VERSION) -no-undefined