Use ldconfig(8) to find installed libraries.

--- src/base/os.lua.orig	Thu Dec  1 19:57:50 2016
+++ src/base/os.lua	Thu Dec  1 20:00:17 2016
@@ -55,42 +55,15 @@
 	end
 
 	function os.findlib(libname)
-		local path, formats
-
-		-- assemble a search path, depending on the platform
-		if os.is("windows") then
-			formats = { "%s.dll", "%s" }
-			path = os.getenv("PATH")
-		elseif os.is("haiku") then
-			formats = { "lib%s.so", "%s.so" }
-			path = os.getenv("LIBRARY_PATH")
-		else
-			if os.is("macosx") then
-				formats = { "lib%s.dylib", "%s.dylib" }
-				path = os.getenv("DYLD_LIBRARY_PATH")
-			else
-				formats = { "lib%s.so", "%s.so" }
-				path = os.getenv("LD_LIBRARY_PATH") or ""
-
-				for _, v in ipairs(parse_ld_so_conf("/etc/ld.so.conf")) do
-					path = path .. ":" .. v
-				end
+		libname = libname:gsub("^lib", "")
+		local file = io.popen("ldconfig -r", "r")
+		for line in file:lines() do
+        		_, last = line:find(":-l" .. libname .. ".%d+.%d+ => ")
+			if last then
+				return line:sub(last + 1)
 			end
-
-			table.insert(formats, "%s")
-			path = path or ""
-			if os.is64bit() then
-				path = path .. ":/lib64:/usr/lib64/:usr/local/lib64"
-			end
-			path = path .. ":/lib:/usr/lib:/usr/local/lib"
 		end
-
-		for _, fmt in ipairs(formats) do
-			local name = string.format(fmt, libname)
-			local result = os.pathsearch(name, path)
-			if result then return result end
-		end
-	end
+        end