diff --git a/Makefile.am b/Makefile.am
index 530b8ded..b63c6025 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,11 +1,14 @@
 noinst_LTLIBRARIES = libjpeg.la
 
-libjpeg_la_SOURCES = jcapimin.c jcapistd.c jccoefct.c jccolor.c jcdctmgr.c \
-	jchuff.c jcinit.c jcmainct.c jcmarker.c jcmaster.c jcomapi.c \
-	jcparam.c jcphuff.c jcprepct.c jcsample.c jctrans.c jdapimin.c \
-	jdapistd.c jdatadst.c jdatasrc.c jdcoefct.c jdcolor.c jddctmgr.c \
-	jdhuff.c jdinput.c jdmainct.c jdmarker.c jdmaster.c jdmerge.c \
-	jdphuff.c jdpostct.c jdsample.c jdtrans.c jerror.c jfdctflt.c \
-	jfdctfst.c jfdctint.c jidctflt.c jidctfst.c jidctint.c jidctred.c \
-	jquant1.c jquant2.c jutils.c jmemmgr.c jmemnobs.c
+HDRS = jchuff.h jdct.h jdhuff.h jinclude.h jmemsys.h jpegint.h jpeglib.h \
+	jversion.h
+
+libjpeg_la_SOURCES = $(HDRS) jcapimin.c jcapistd.c jccoefct.c jccolor.c \
+	jcdctmgr.c jchuff.c jcinit.c jcmainct.c jcmarker.c jcmaster.c \
+	jcomapi.c jcparam.c jcphuff.c jcprepct.c jcsample.c jctrans.c \
+	jdapimin.c jdapistd.c jdatadst.c jdatasrc.c jdcoefct.c jdcolor.c \
+	jddctmgr.c jdhuff.c jdinput.c jdmainct.c jdmarker.c jdmaster.c \
+	jdmerge.c jdphuff.c jdpostct.c jdsample.c jdtrans.c jerror.c \
+	jfdctflt.c jfdctfst.c jfdctint.c jidctflt.c jidctfst.c jidctint.c \
+	jidctred.c jquant1.c jquant2.c jutils.c jmemmgr.c jmemnobs.c