fix scalapack suffix for osx

var/spack/repos/builtin/packages/netlib-scalapack/package.py

@@ -1,4 +1,5 @@
 from spack import *
+import sys
 
 class NetlibScalapack(Package):
     """ScaLAPACK is a library of high-performance linear algebra routines for parallel distributed memory machines"""
@@ -41,8 +42,8 @@ def install(self, spec, prefix):
             make("install")
 
     def setup_dependent_environment(self, module, spec, dependent_spec):
-        # TODO treat OS that are not Linux...
-        lib_suffix = '.so' if '+shared' in spec['scalapack'] else '.a'
+        lib_dsuffix = '.dylib' if sys.platform == 'darwin' else '.so'
+        lib_suffix = lib_dsuffix if '+shared' in spec['scalapack'] else '.a'
 
         spec['scalapack'].fc_link = '-L%s -lscalapack' % spec['scalapack'].prefix.lib
         spec['scalapack'].cc_link = spec['scalapack'].fc_link