diff --git a/.gitignore b/.gitignore
index f4aba19..2bcc5be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+rawspec_fbutils
 fileiotest
 librawspec.so
 rawspec
diff --git a/Makefile b/Makefile
index fa54405..c73b1ad 100644
--- a/Makefile
+++ b/Makefile
@@ -73,6 +73,9 @@ fileiotest: librawspec.so
 fileiotest: fileiotest.o
 	$(VERBOSE) $(NVCC) $(NVCC_FLAGS) $(GENCODE_FLAGS) -o $@ $^ -L. -lrawspec
 
+rawspec_fbutils: rawspec_fbutils.c rawspec_fbutils.h
+	$(CC) -o $@ -DFBUTILS_TEST -ggdb -O0 $< -lm
+
 install: rawspec.h librawspec.so
 	mkdir -p $(BINDIR)
 	cp -p rawspec $(BINDIR)