test for maximum errno value, since Solaris has no sys_nerr

auto/unix

@@ -134,6 +134,29 @@ if [ $ngx_found = no ]; then
 fi
 
 
+if [ $ngx_found = no ]; then
+
+    # Solaris has no sys_nerr
+    ngx_feature='maximum errno'
+    ngx_feature_name=NGX_SYS_NERR
+    ngx_feature_run=value
+    ngx_feature_incs='#include <errno.h>
+                      #include <stdio.h>'
+    ngx_feature_path=
+    ngx_feature_libs=
+    ngx_feature_test='int  n;
+                      for (n = 1; n < 1000; n++) {
+                          errno = 0;
+                          strerror(n);
+                          if (errno == EINVAL) {
+                              printf("%d", n);
+                              return 0;
+                          }
+                     }'
+    . auto/feature
+fi
+
+
 ngx_feature="localtime_r()"
 ngx_feature_name="NGX_HAVE_LOCALTIME_R"
 ngx_feature_run=no