AUTOMAKE_OPTIONS = foreign
-include_HEADERS = jni.h jvmpi.h
+# May be used by various substitution variables.
+gcc_version := $(shell cat $(top_srcdir)/../gcc/BASE-VER)
+
+# autoconf2.13's target_alias
+target_noncanonical = @target_noncanonical@
+
+tool_include_dir = $(libdir)/gcc/$(target_noncanonical)/$(gcc_version)/include
+## The 'jni.h' here is fairly hacky, but it is simpler than trying to
+## tell Classpath about our peculiar install directory.
+tool_include__HEADERS = jni_md.h ../classpath/include/jawt.h \
+ ../classpath/include/jawt_md.h jvmpi.h ../classpath/include/jni.h