[Spot] Swig is required, but isn't

Hello, I was trying to build Spot on a fresh ArchLinux install, when I came across this issue:

$ ./configure ... [...] checking for swig3.0... no checking for swig... no [...]

$ make [...] swig -c++ -python -py3 -O -nofastproxy -MD -I../buddy/src -MF .deps/buddy_wrap.TPcxx ./buddy.i make[3]: swig: Command not found [...] make: *** [Makefile:1163: all] Error 2

If Spot requires Swig, shouldn't `configure` fail ? Or, if Swig is only required for users who want to build the Python library, shouldn't the latter not be included in the `all` rule ? If that's any help, I attached my config.log. Regards, -- Clément 'Cigix' Gillard "EAT SLEEP EAT REPEAT" @skrillbug_bot, 2016-06-23