#15136: spkg-install improvements
-------------------------+-------------------------------------------------
   Reporter:  felixs     |            Owner:
       Type:             |           Status:  new
  enhancement            |        Milestone:  sage-5.12
   Priority:  major      |         Keywords:  spkg-install idempotence
  Component:  packages:  |  environment
  standard               |          Authors:  Felix Salfelder
  Merged in:             |  Report Upstream:  N/A
  Reviewers:             |           Branch:
Work issues:             |     Dependencies:  #14750, #14804
     Commit:             |
   Stopgaps:             |
-------------------------+-------------------------------------------------
 The build system #14796 works better with some minor tweaks to some spkg-
 install scripts.

 - with idempotence, "keepbuilt" starts to make sense
 - without hardwired paths, compiling with packages disabled (=fallback to
 system) works
 - with environment in `$SAGE_ETC/env.d/*`, run time environment is more
 flexible

 these changes are minimal (for each package) and are intended to not break
 the old build system.

--
Ticket URL: <http://trac.sagemath.org/ticket/15136>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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