Use ghc return value instead of looking for the stderr, do not throw error when an haskell module throws a build failure, e.g. because of false positives like this one (debian/arm*)
"You are using a new version of LLVM that hasn't been tested yet!
We will try though..."
# Find liblua
#
# Once done this will define
# LUA_FOUND - system has Lua
# LUA_INCLUDE_DIR - the Lua include directory
# LUA_LIBRARY - The library needed to use Lua
# Copyright (c) 2013, Vittorio Giovara <vittorio.giovara@gmail.com>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
include(FindPackageHandleStandardArgs)
find_path(LUA_INCLUDE_DIR lua.h
PATHS /usr/include /usr/local/include /usr/pkg/include
PATH_SUFFIXES lua5.1 lua51)
find_library(LUA_LIBRARY NAMES lua51 lua5.1 lua-5.1 lua
PATHS /lib /usr/lib /usr/local/lib /usr/pkg/lib)
find_package_handle_standard_args(Lua DEFAULT_MSG LUA_LIBRARY LUA_INCLUDE_DIR)
mark_as_advanced(LUA_INCLUDE_DIR LUA_LIBRARY)