diff --git a/Makefile b/Makefile
index 2ba0bced..48ccf960 100644
--- a/Makefile
+++ b/Makefile
@@ -4,8 +4,6 @@
 CXX       ?= clang++
 CC        ?= clang
 RM        ?= rm -f
-MKDIR     ?= $(INSTALL) -d
-SYMLINK   ?= ln -s
 
 ### library configuration ###
 LIB_NAME     = tree_sitter
diff --git a/src/compiler/rules/character_range.h b/src/compiler/rules/character_range.h
index bb6fe2db..bbc8a580 100644
--- a/src/compiler/rules/character_range.h
+++ b/src/compiler/rules/character_range.h
@@ -2,6 +2,7 @@
 #define __tree_sitter_character_range_h__
 
 #include <map>
+#include <string>
 
 namespace tree_sitter {
     namespace rules {