--- alienfile.orig	2019-03-19 19:54:57.000000000 -0700
+++ alienfile	2019-03-23 18:37:06.000000000 -0700
@@ -24,8 +24,7 @@
 
 my @try_flags = (
   { cflags => '',                             libs => '-lxml2' },
-  { cflags => '-I/usr/include/libxml2',       libs => '-lxml2' },
-  { cflags => '-I/usr/local/include/libxml2', libs => '-lxml2' },
+  { cflags => '-I__PREFIX__/include/libxml2', libs => '-lxml2' },
 );
 
 plugin 'PkgConfig' => 'libxml-2.0';