The automake fails with this output:
/usr/share/automake-1.10/am/depend2.am: am__fastdepCXX does not appear in AM_CONDITIONAL
/usr/share/automake-1.10/am/depend2.am: The usual way to define `am__fastdepCXX' is to add `AC_PROG_CXX'
/usr/share/automake-1.10/am/depend2.am: to `configure.ac' and run `aclocal' and `autoconf' again.
libMUSCLE/Makefile.am: C++ source seen but `CXX' is undefined
libMUSCLE/Makefile.am: The usual way to define `CXX' is to add `AC_PROG_CXX'
libMUSCLE/Makefile.am: to `configure.ac' and run `autoconf' again.
but given this might sound pretty unintelligible, the end ofthe story is that the package uses C++ sources, but doesn't call AC_PROG_CXX in the configure.ac file; you should add it there before running eautoreconf.
This fails with libtool 2.2 because that version does _not_ force C++ (and Fortran) compilers to be detected for all the packages using libtool.
Fixed upstream, bumped, thanks