diff --git a/.gitignore b/.gitignore
index 48393a5..14e404c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,4 +20,7 @@ acs.err
 *.swp
 *.swo
 
+# Metaprogram build
+*.out
+lex.yy.c
 
diff --git a/build.sh b/build.sh
old mode 100644
new mode 100755
diff --git a/build_files/.gitignore b/build_files/.gitignore
new file mode 100644
index 0000000..49a8e78
--- /dev/null
+++ b/build_files/.gitignore
@@ -0,0 +1,5 @@
+# There should be nothing in this directory except this file itself on the repo.
+.
+!.gitignore
+
+
diff --git a/build_metatool.sh b/build_metatool.sh
new file mode 100755
index 0000000..aa8793a
--- /dev/null
+++ b/build_metatool.sh
@@ -0,0 +1,4 @@
+cd meta_src
+
+flex scanner.l
+gcc lex.yy.c -o metatool.out
diff --git a/meta_src/scanner.l b/meta_src/scanner.l
new file mode 100644
index 0000000..aa00cc3
--- /dev/null
+++ b/meta_src/scanner.l
@@ -0,0 +1,50 @@
+%{
+
+#include <stdio.h>
+
+FILE* outfile1 = NULL;
+FILE* outfile2 = NULL;
+FILE* interface_file = NULL;
+
+%}
+
+%option noyywrap
+%option nounput
+%option noinput
+
+%x LEX_STATE_EXPORT
+%x LEX_STATE_EXPORT_FUNCTION
+
+%%
+
+<INITIAL,LEX_STATE_EXPORT>. fprintf(outfile1, "%s", yytext); fprintf(outfile2, "%s", yytext);
+<INITIAL>\n fprintf(outfile1, "%s", yytext); fprintf(outfile2, "%s", yytext);
+<INITIAL>"$export_split" BEGIN(LEX_STATE_EXPORT);
+
+<LEX_STATE_EXPORT>"function" fprintf(outfile1, "function"); fprintf(outfile2, "function"); fprintf(interface_file, "function"); BEGIN(LEX_STATE_EXPORT_FUNCTION);
+<LEX_STATE_EXPORT_FUNCTION>"{" fprintf(outfile1, "{"); fprintf(outfile2, "{"); fprintf(interface_file, "{return 0;}"); BEGIN(INITIAL);
+<LEX_STATE_EXPORT_FUNCTION>(.|\n) fprintf(outfile1, "%s", yytext); fprintf(outfile2, "%s", yytext); fprintf(interface_file, "%s", yytext);
+<LEX_STATE_EXPORT>\n fprintf(outfile1, "\n"); fprintf(outfile2, "\n"); fprintf(interface_file, "\n"); BEGIN(INITIAL);
+
+%%
+
+int main(int argn, char** argv)
+{
+	if(argn < 4)
+	{
+		printf("Give output file as argument.\n");
+		return 1;
+	}
+
+	outfile1 = fopen(argv[1], "w");
+	outfile2 = fopen(argv[2], "w");
+	interface_file = fopen(argv[3], "w");
+
+	yylex();
+
+	fclose(outfile1);
+	fclose(outfile2);
+	fclose(interface_file);
+
+	return 0;
+}