diff --git a/Makefile b/Makefile
index deff006f..cb1446e8 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ LIBCS_CXXFLAGS = \
 	-std=c++1z -Wall -Wextra -Wshadow -Wold-style-cast -Iinclude -Isrc -g \
 	-fvisibility=hidden -I$(OSTD_PATH)
 
-LIBCS_LDFLAGS = -shared
+LIBCS_LDFLAGS = $(OSTD_PATH)/libostd.a
 
 LIBCS_OBJ = \
 	src/cubescript.o \
@@ -29,8 +29,9 @@ $(LIBCS_LIB): $(LIBCS_OBJ)
 	ar rcs $(LIBCS_LIB) $(LIBCS_OBJ)
 
 repl: $(LIBCS_LIB) tools/repl.cc tools/linenoise.cc tools/linenoise.hh
-	$(CXX) $(CXXFLAGS) $(LIBCS_CXXFLAGS) $(LDFLAGS) \
-	-DCS_REPL_USE_LINENOISE tools/linenoise.cc tools/repl.cc -o repl $(LIBCS_LIB)
+	$(CXX) $(CXXFLAGS) $(LIBCS_CXXFLAGS) \
+	-DCS_REPL_USE_LINENOISE tools/linenoise.cc tools/repl.cc \
+    $(LDFLAGS) $(LIBCS_LDFLAGS) -o repl $(LIBCS_LIB)
 
 clean:
 	rm -f $(LIBCS_LIB) $(LIBCS_OBJ) repl
diff --git a/tools/repl.cc b/tools/repl.cc
index 38bfaf0c..a1cf1f02 100644
--- a/tools/repl.cc
+++ b/tools/repl.cc
@@ -159,7 +159,7 @@ static inline cs_command *get_hint_cmd(cs_state &cs, ostd::string_range buf) {
 /* usage */
 
 void print_usage(ostd::string_range progname, bool err) {
-    auto &s = err ? ostd::err : ostd::out;
+    auto &s = err ? ostd::cerr : ostd::cout;
     s.writeln(
         "Usage: ", progname, " [options] [file]\n"
         "Options:\n"
@@ -194,7 +194,7 @@ static bool do_call(cs_state &cs, ostd::string_range line, bool file = false) {
     try {
         if (file) {
             if (!cs.run_file(line, ret)) {
-                ostd::err.writeln("cannot read file: ", line);
+                ostd::cerr.writeln("cannot read file: ", line);
             }
         } else {
             cs.run(line, ret);
@@ -216,7 +216,7 @@ static bool do_call(cs_state &cs, ostd::string_range line, bool file = false) {
         }
         ostd::writeln(!is_lnum ? "stdin: " : "stdin:", e.what());
         if (e.get_stack().get()) {
-            cscript::util::print_stack(ostd::out.iter(), e.get_stack());
+            cscript::util::print_stack(ostd::cout.iter(), e.get_stack());
             ostd::write('\n');
         }
         return false;
@@ -370,7 +370,7 @@ endargs:
             return 0;
         } else {
             std::string str;
-            for (char c = '\0'; (c = ostd::in.getchar()) != EOF;) {
+            for (char c = '\0'; (c = ostd::cin.get_char()) != EOF;) {
                 str += c;
             }
             do_call(gcs, str);