py-numpy: fix 10.11 builds using MP clang 3.7

python/py-numpy/Portfile

@@ -69,6 +69,11 @@ if {${name} ne ${subport}} {
     compilers.setup         -clang -gcc44 -gcc45 \
                             -gcc46 -gcc47 -gcc48 -g95 clang37
 
+    # https://trac.macports.org/ticket/58771
+    if { ${os.major} == 15 } {
+        default_variants-append +clang37
+    }
+
     depends_lib-append      port:fftw-3 \
                             port:py${python.version}-nose \
                             port:py${python.version}-cython
@@ -103,7 +108,7 @@ if {${name} ne ${subport}} {
     # https://github.com/numpy/numpy/issues/12230
     if {![variant_isset atlas] &&
         ![variant_isset openblas]} {
-        default_variants +openblas
+        default_variants-append +openblas
     }
 
     # when using ATLAS (whether by default or specified by the user via
@@ -222,12 +227,12 @@ variant."
     }
 
     if {![fortran_variant_isset]} {
-        default_variants      +gfortran
+        default_variants-append +gfortran
     }
 
     # determine if special wrapper values are needed for compiler names
     # a procedure is needed since variants from PortGroup compilers must
-    #    be evaluated before it can be determined if clang is being used
+    # be evaluated before it can be determined if clang is being used
     proc use_wrapper {} {
         global configure.cc