Applied patch from Christophe Boyanique to add an egrep alias for grep.
diff --git a/Config.h b/Config.h
index 13d7f0c..bf07525 100644
--- a/Config.h
+++ b/Config.h
@@ -329,6 +329,9 @@
 // Support for the -A -B and -C context flags in grep
 //#define BB_FEATURE_GREP_CONTEXT
 //
+// Support for the EGREP applet (alias to the grep applet)
+//#define BB_FEATURE_GREP_EGREP_ALIAS
+//
 // Tell tftp what commands that should be supported.
 #define BB_FEATURE_TFTP_PUT
 #define BB_FEATURE_TFTP_GET