Minor build nits in 7.3rc1

Hi

1)
configure fails too easily if your libraries and include files are in a
funny place. When you specify --prefix=/somewhere, maybe it should use "-L
/somewhere/lib" and "-I/somewhere/include" by default when checking if
things exist.
Workaround: I had to add the options to LDFLAGS and CPPFLAGS myself to get
readline noticed.

2)
The makefile contains many rm. I usually like to alias rm="rm -i" for
safety, so I had to answer (y/n) a lot of times. Could the makefile please
use rm -f?

Thanks

Peter Harris
Kyndal Spirits

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