Comment 1 for bug 792319

Reproduced with Inkscape 0.48+devel r10252
Not reproduced with Inkscape 0.47 on OS X 10.5.8 (i386)

For testing, a simple test extension calling a shell script was used, with
a)
<command reldir="extensions" interpreter="bash">debug-interpreter.sh</command>
b)
<command reldir="extensions" interpreter="bash --login">debug-interpreter.sh</command>

Both variants work fine in 0.47, but fail in 0.48(+devel) with this error message:

Can't Spawn!!! spawn returns: Failed to execute child process "" (No such file or directory)