diff --git a/build.sh b/build.sh
index d8596eb..bd6815d 100755
--- a/build.sh
+++ b/build.sh
@@ -1,10 +1,11 @@
-#!/bin/sh
+#!/bin/bash
+LUA=${LUA:-lua}
 rm -r target/*
 mkdir target &>/dev/null
-lua luapreproc.lua module/init.lua target/init.lua
+$LUA luapreproc.lua module/init.lua target/init.lua
 echo _OSVERSION=\"PsychOS 2.0a2-$(git rev-parse --short HEAD)\" > target/version.lua
 cat target/version.lua target/init.lua > target/tinit.lua
 mv target/tinit.lua target/init.lua
 cp -r service/ lib/ cfg/ target/
-lua finddesc.lua $(find module/ -type f) $(find lib/ -type f) > apidoc.md
+$LUA finddesc.lua $(find module/ -type f) $(find lib/ -type f) > apidoc.md
 rm target/version.lua
diff --git a/luapreproc.lua b/luapreproc.lua
index cf2e176..00b2a8b 100755
--- a/luapreproc.lua
+++ b/luapreproc.lua
@@ -179,6 +179,7 @@ local env = {code = ""}
 setmetatable(env, {__index=_env})
 env:process(arg[1])
 local tmpfile = os.tmpname()
+if tmpfile:sub(#tmpfile) == "." then tmpfile = tmpfile:sub(1, #tmpfile - 1) end
 local tmpf = io.open(tmpfile, "wb")
 tmpf:write(env.code)
 tmpf:close()