diff --git a/stim/parser/filename.h b/stim/parser/filename.h
index f33a492..3f4ab6f 100644
--- a/stim/parser/filename.h
+++ b/stim/parser/filename.h
@@ -235,8 +235,8 @@ public:
 			}
 			FindClose(hFind);
 		}
-		return file_list;
-#else
+
+#elif BOOST_PRECOMPILED
 
 		boost::filesystem::path p(dir());	//create a path from the current filename
 		std::vector<stim::filename> file_list;
@@ -265,13 +265,12 @@ public:
 
 			}
 
-		}
-		return file_list;
-
-
-//	std::cout<<"File lists aren't currently supported on Unix/Linux systems."<<std::endl;
-//	exit(1);
+		}		
+#else
+		std::cout<<"ERROR: UNIX systems don't support file lists without the Boost precompiled libraries."<<std::endl;
+		exit(1);
 #endif
+		return file_list;
 	}
 	//**************************************************************************************************
 
--
libgit2 0.21.4