checkpkg: use assure for erc

bin/epm-checkpkg

@@ -37,11 +37,8 @@ check_pkg_integrity()
 		true
 		;;
 	*)
+		assure_exists erc
 		docmd erc test "$PKG" && return
-		which erc >/dev/null 2>/dev/null && fatal "Check failed."
-		fatal "Install erc package for file package."
-		# TODO
-		epm install erc
 		;;
 	esac
 }

bin/epm-sh-functions

@@ -281,6 +281,9 @@ assure_exists()
 		apt-file)
 			epm install apt-file
 			;;
+		erc)
+			epm install erc
+			;;
 		update-kernel|remove-old-kernels)
 			epm install update-kernel
 			;;