make port to install to a different PREFIX

[Roman Neuhauser]

# fernan at iib.unsam.edu.ar / 2005-10-03 15:49:04 -0300:
> I'm the maintainer of the biology/emboss port. The port
> installs by default to $PREFIX which, in most cases should
> be $LOCALBASE (i.e. /usr/local).
> 
> EMBOSS is a big package, with lots of executable files. It
> is thus not surprising that some of the executables have the
> same name as those installed by other ports.
> 
> Right now these are the recorded conflicts:
> CONFLICTS=      nss-* qmail-ldap2-* digest-*
> 
> To work around this, I was thinking about installing
> biology/emboss by default to PREFIX/emboss.
> However, I'm having problems in getting this to work.
> 
> This does not work:
> CONFIGURE_ARGS+= --prefix=${PREFIX}/emboss
> 
> and neither does this:
> PREFIX?= ${PREFIX}/emboss
> 
> because obviously 'Variable PREFIX is recursive.'

    Either use PREFIX?=${LOCALBASE}/emboss, or use another approach (IMO
    better, but depends on whether the configure script supports it):
    CONFIGURE_ARGS+=--program-prefix=emboss-

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