Add makefile rule to copy headers from kernel tree

.gitignore

@@ -13,6 +13,8 @@ bsd-core/*/machine
 .deps
 .libs
 .tmp_versions
+.*check*
+.*install*
 Makefile
 Makefile.in
 aclocal.m4

Makefile.am

@@ -28,3 +28,10 @@ pkgconfigdir = @pkgconfigdir@
 pkgconfig_DATA = libdrm.pc
 
 EXTRA_DIST = libdrm.pc.in
+
+copy-headers :
+	cp -r $(kernel_source)/usr/include/drm $(top_srcdir)/include
+
+commit-headers : copy-headers
+	git add include
+	git commit -am "Copy headers from kernel $$(GIT_DIR=$(kernel_source)/.git git describe)"

configure.ac

@@ -188,6 +188,11 @@ fi
 
 AM_CONDITIONAL(HAVE_INTEL, [test "x$INTEL" != "xno"])
 
+AC_ARG_WITH([kernel-source],
+            [AS_HELP_STRING([--with-kernel-source],
+              [specify path to linux kernel source])],
+	    [kernel_source="$with_kernel_source"])
+AC_SUBST(kernel_source)
 
 AC_SUBST(WARN_CFLAGS)
 AC_OUTPUT([