diff --git a/Makefile b/Makefile
index e98b796..5cdc68e 100644
--- a/Makefile
+++ b/Makefile
@@ -6,6 +6,17 @@ $(OUT): input.o exec.o
 tests: $(TESTS)
 	for i in $(TESTS); do ./$$i -v; done
 
+libscomm_amalg.h: exec.h input.h
+	echo '#pragma once' > libscomm_amalg.h
+	cat input.h exec.h | \
+	sed 's/#pragma .*//g; s/#include ".*//g' \
+	>> libscomm_amalg.h
+
+libscomm_amalg.c: exec.c input.c libscomm_amalg.h
+	echo '#include "libscomm_amalg.h"' > libscomm_amalg.c
+	cat exec.c input.c | sed 's/#include ".*//g' \
+	>> libscomm_amalg.c
+
 TEST_EXEC=test/exec.o exec.o
 test/exec: $(TEST_EXEC)
 	$(CC) -Wall $(TEST_EXEC) -o test/exec