diff --git a/crypto/Makefile.am.arc4random b/crypto/Makefile.am.arc4random
new file mode 100644
index 0000000..c44051c
--- /dev/null
+++ b/crypto/Makefile.am.arc4random
@@ -0,0 +1,45 @@
+if !HAVE_ARC4RANDOM_BUF
+libcompat_la_SOURCES += compat/arc4random.c
+
+if !HAVE_GETENTROPY
+if HOST_AIX
+libcompat_la_SOURCES += compat/getentropy_aix.c
+endif
+if HOST_FREEBSD
+libcompat_la_SOURCES += compat/getentropy_freebsd.c
+endif
+if HOST_HPUX
+libcompat_la_SOURCES += compat/getentropy_hpux.c
+endif
+if HOST_LINUX
+libcompat_la_SOURCES += compat/getentropy_linux.c
+endif
+if HOST_NETBSD
+libcompat_la_SOURCES += compat/getentropy_netbsd.c
+endif
+if HOST_DARWIN
+libcompat_la_SOURCES += compat/getentropy_osx.c
+endif
+if HOST_SOLARIS
+libcompat_la_SOURCES += compat/getentropy_solaris.c
+endif
+if HOST_WIN
+libcompat_la_SOURCES += compat/getentropy_win.c
+endif
+endif
+
+endif
+
+noinst_HEADERS =
+noinst_HEADERS += compat/arc4random.h
+noinst_HEADERS += compat/arc4random_aix.h
+noinst_HEADERS += compat/arc4random_freebsd.h
+noinst_HEADERS += compat/arc4random_hpux.h
+noinst_HEADERS += compat/arc4random_linux.h
+noinst_HEADERS += compat/arc4random_netbsd.h
+noinst_HEADERS += compat/arc4random_osx.h
+noinst_HEADERS += compat/arc4random_solaris.h
+noinst_HEADERS += compat/arc4random_win.h
+noinst_HEADERS += compat/chacha_private.h
+
+