openscad: destroot fails when prefix is not /opt/local

[ryandesign (Ryan Carsten Schmidt)]

--->  Fetching distfiles for openscad
--->  Verifying checksum(s) for openscad
--->  Extracting openscad
--->  Configuring openscad
--->  Building openscad
--->  Staging openscad into destroot
Error: org.macports.destroot for port openscad returned: error renaming "/Volumes/Data/macports/lion/var/macports/build/_Volumes_Data_macports_dports_science_openscad/openscad/work/destroot/opt/local/bin/OpenSCAD.app": no such file or directory

This was on Lion but I doubt it matters since the Portfile obviously contains "/opt/local" in many places, which should probably be changed to "${prefix}".

[mf2k (Frank Schima)]

r107430. Thanks for the report!