diff --git a/src/Makefile.am b/src/Makefile.am
--- a/src/Makefile.am
+++ b/src/Makefile.am
bin_PROGRAMS = fits2jpeg
-fits2jpeg_SOURCES = fits2jpeg.c messages.c getopt.c image.c signal_handler.c
+fits2jpeg_SOURCES = fits2jpeg.c image.c \
+ messages.c filesys.c \
+ getopt.c signal_handler.c
noinst_HEADERS = fits2jpeg.h
\ No newline at end of file