diff --git a/.hgignore b/.hgignore
index d84b781..218b7c9 100644
--- a/.hgignore
+++ b/.hgignore
@@ -1,3 +1,5 @@
 syntax: glob
 Release\*
-Debug\*
\ No newline at end of file
+Debug\*
+*.o
+sat
diff --git a/Julian.cpp b/Julian.cpp
index 9a1b0c5..5692a2b 100644
--- a/Julian.cpp
+++ b/Julian.cpp
@@ -25,14 +25,14 @@ Julian::Julian() {
 #else
     struct timeval tv;
     gettimeofday(&tv, NULL);
-    struct tm;
-    gmtime_r(&tv.tv_sec, &tm);
-    Initialize(tm.tm_year + 1900,
-            tm.tm_mon,
-            tm.tm_mday,
-            tm.tm_hour,
-            tm.tm_min,
-            (double) tm.tm_sec + (double) tv.tv_usec / 1000000.0)
+    struct tm gmt;
+    gmtime_r(&tv.tv_sec, &gmt);
+    Initialize(gmt.tm_year + 1900,
+            gmt.tm_mon,
+            gmt.tm_mday,
+            gmt.tm_hour,
+            gmt.tm_min,
+            (double) gmt.tm_sec + (double) tv.tv_usec / 1000000.0);
 #endif
 }
 
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..15208f4
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,23 @@
+CC=g++
+CFLAGS=-c -Wall -g
+LDFLAGS=
+SOURCES=Coord.cpp \
+	Globals.cpp \
+	Julian.cpp \
+	main.cpp \
+	SGDP4.cpp \
+	Tle.cpp \
+	Vector.cpp
+OBJECTS=$(SOURCES:.cpp=.o)
+EXECUTABLE=sat
+
+all: $(SOURCES) $(EXECUTABLE)
+
+$(EXECUTABLE): $(OBJECTS)
+	$(CC) $(LDFLAGS) $(OBJECTS) -o $@
+
+.cpp.o:
+	$(CC) $(CFLAGS) $< -o $@
+
+clean:
+	rm -rf *.o $(EXECUTABLE)