The failure:

In file included from /usr/include/ruby-1.9.1/ruby.h:32:0,
                 from Qt.cpp:49:
/usr/include/ruby-1.9.1/ruby/ruby.h:24:25: fatal error: ruby/config.h: No such file or directory
compilation terminated.
make[5]: *** [Qt.lo] Error 1


The oddity is no such failure on Slackware 13.1 or 13.37, 32 or 64 bit. config.h is installed in the same place on all systems.

Any ideas?

Darrell