Ticket #32041: apple-gcc42.diff

Portfile

@@ -117 +117 @@
         }
 }
 
+pre-build {
+    foreach {badport badfile} "libunwind-headers ${prefix}/include/unwind.h" {
+        if {[file exists ${badfile}]} {
+            ui_error "${name} cannot be built while ${badport} is active."
+            ui_error "Please deactivate ${badport} and try again."
+            ui_error "You can reactivate ${badport} again later."
+            return -code error "${badport} is installed"
+        }
+    }
+}
+
 # TODO: Use MacPorts dependencies
 build.env \
         LIBRARY_PATH="/usr/lib" \