py-mpi4py : better error checking (no errors thrown in body of port)

git-svn-id: https://svn.macports.org/repository/macports/trunk/dports@86256 d073be05-634f-4543-b044-5fe20cf6d1d6

python/py-mpi4py/Portfile

@@ -8,8 +8,6 @@ name            py-mpi4py
 version         1.2.2
 revision        2
 categories      python
-python.versions 25 26 27
-python.default_version 27
 description     MPI for Python - Python bindings for MPI
 long_description \
     MPI for Python (mpi4py) provides bindings of the Message Passing Interface \
@@ -33,20 +31,23 @@ checksums       md5     91c1b962529adfd90b9f9f98db5624b7 \
                 rmd160  434d411aa4e954706f2ca8bdde115dc654b58f21
 platforms       darwin
 
+python.versions 25 26 27
+python.default_version 27
+
 depends_lib-append port:openmpi
 build.args-append  "--mpicc=${prefix}/bin/openmpicc"
 
 # openmpi and mpich2 are not universal
 universal_variant no
 
-if {  ${os.major} < 9 && [variant_isset mpich2] } {
-    error "Mac OS 10.4 and earlier require openmpi"
-}
+if { ${os.platform} != "darwin" || ${os.major} > 8 } {
+
+    variant mpich2 description {builds with the mpich2 port} {
+        build.args-delete   "--mpicc=${prefix}/bin/openmpicc"
+        depends_lib-delete  port:openmpi
+        depends_lib-append  port:mpich2
+    }
 
-variant mpich2 description {builds with the mpich2 port} {
-    depends_lib-append  port:mpich2
-    depends_lib-delete  port:openmpi
-    build.args-delete   "--mpicc=${prefix}/bin/openmpicc"
 }
 
 variant interpreter description {builds an mpi enabled python interpreter} {