| >From the configure output:
| ==========================
| [...]
| configure: configuring in libltdl
| configure: running sh './configure' --prefix=/usr/local --datadir=/usr/share
|--sysconfdir=/etc --localstatedir=/var -infodir=/usr/info --enable-
| htmldoc LDFLAGS=-s CXX=g++ CC=gcc --enable-ltdl-convenience --cache-file=/dev/null
|--srcdir.
| configure: warning: LDFLAGS=-s: invalid host type
| configure: warning: CXX=g++: invalid host type
| configure: error: can only configure for one host and one target at a time
| configure: error: sh './configure' failed for libltdl
This configure is not from Autoconf 2.50. Update _that_ guy.