diff --git a/.gitignore b/.gitignore
index ff78bae..c382fbc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,4 @@
 *.o
-tinyvm
-tinyvm-debug
 profile
 valgrind*
 cachegrind*
diff --git a/GNUmakefile b/GNUmakefile
index 3167f78..51a9361 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -17,6 +17,7 @@ BIN_DIR = bin
 LIB_DIR = lib
 INC_DIR = include
 PROGRAM_DIR = programs
+INSTALL_PREFIX = /usr/
 
 DEBUG = no
 PROFILE = no
@@ -41,9 +42,9 @@ CFLAGS += $(OPTIMIZATION)
 all: libtvm tvmi tdb
 
 install: libtvm tvmi
-	cp -f bin/tvmi /usr/bin/
-	cp -rf include/tvm /usr/include/
-	cp -f lib/libtvm* /usr/lib/
+	cp -f $(BIN_DIR)/tvmi $(INSTALL_PREFIX)/bin/
+	cp -rf $(INC_DIR)/tvm $(INSTALL_PREFIX)/include/
+	cp -f $(LIB_DIR)/libtvm* $(INSTALL_PREFIX)/lib/
 
 uninstall:
 	rm -rf /usr/bin/tvmi
@@ -51,16 +52,13 @@ uninstall:
 	rm -rf /usr/lib/libtvm*
 
 libtvm: $(LIBTVM_OBJECTS)
-	mkdir -p $(LIB_DIR)
 	ar rcs $(LIB_DIR)/libtvm.a $(LIBTVM_OBJECTS)
 
 # Build the TVM interpreter
 tvmi: libtvm
-	mkdir -p $(BIN_DIR)
 	$(CC) $(LFLAGS) tvmi.c -ltvm -o $(BIN_DIR)/tvmi
 
 tdb: libtvm $(TDB_OBJECTS)
-	mkdir -p $(BIN_DIR)
 	$(CC) $(LFLAGS) $(TDB_OBJECTS) -ltvm -o $(BIN_DIR)/tdb
 
 %.o: %.c
diff --git a/bin/.gitignore b/bin/.gitignore
new file mode 100644
index 0000000..0dd9413
--- /dev/null
+++ b/bin/.gitignore
@@ -0,0 +1,3 @@
+tvmi*
+tdb*
+core*
diff --git a/lib/.gitignore b/lib/.gitignore
new file mode 100644
index 0000000..51bcec0
--- /dev/null
+++ b/lib/.gitignore
@@ -0,0 +1,2 @@
+*.a
+*.so
diff --git a/libtvm/.gitignore b/libtvm/.gitignore
new file mode 100644
index 0000000..5761abc
--- /dev/null
+++ b/libtvm/.gitignore
@@ -0,0 +1 @@
+*.o