build system: correct warning about 'INCLUDES'

This suppresses this warning when running build.sh:

Makefile.am:5: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')

diff --git a/Makefile.am b/Makefile.am
index 5267123..35f24cb 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -2,7 +2,7 @@ ACLOCAL_AMFLAGS = -I libltdl/m4
 
 SUBDIRS = libltdl src bindings .
 
-INCLUDES = $(LTDLINCL)
+AM_CPPFLAGS = $(LTDLINCL)
 
 EXTRA_DIST = contrib version-gen.sh