diff --git a/support/xhpast/Makefile b/support/xhpast/Makefile
--- a/support/xhpast/Makefile
+++ b/support/xhpast/Makefile
@@ -1,6 +1,7 @@
 BISONFLAGS = --verbose --name-prefix xhpast
 CPPFLAGS   = -fPIC -Wall
 FLEXFLAGS  = -CFr
+XHPAST_VERSION := $(shell ./bin/xhpast-generate-version.php)
 
 ifdef DEBUG
 	BISONFLAGS += --debug
@@ -64,7 +65,7 @@
 %.o: %.cpp
 	$(CXX) -c $(CPPFLAGS) -o $@ $<
 
-node_names.hpp parser_nodes.php: generate_nodes.php
+node_names.hpp parser_nodes.php: bin/xhpast-generate-nodes.php
 	php -f $<
 
 parser.yacc.o: scanner.lex.hpp
@@ -74,4 +75,4 @@
 	$(AR) -crs $@ $^
 
 xhpast: xhpast.cpp libxhpast.a
-	$(CXX) $(CPPFLAGS) -o $@ $^
+	$(CXX) $(CPPFLAGS) -D XHPAST_VERSION='"$(XHPAST_VERSION)"' -o $@ $^
diff --git a/support/xhpast/generate_nodes.php b/support/xhpast/bin/xhpast-generate-nodes.php
rename from support/xhpast/generate_nodes.php
rename to support/xhpast/bin/xhpast-generate-nodes.php
--- a/support/xhpast/generate_nodes.php
+++ b/support/xhpast/bin/xhpast-generate-nodes.php
@@ -1,9 +1,16 @@
 #!/usr/bin/env php
 <?php
 
-require_once dirname(__FILE__).'/../../scripts/__init_script__.php';
+$arcanist_root = dirname(dirname(dirname(dirname(__FILE__))));
+require_once $arcanist_root.'/support/init/init-script.php';
+
+$xhpast_root = dirname(dirname(__FILE__));
+
+$hpp_outpath = $xhpast_root.'/node_names.hpp';
+$php_outpath = $xhpast_root.'/parser_nodes.php';
 
 $offset = 9000;
+
 $nodes = array(
   'n_PROGRAM',
   'n_SYMBOL_NAME',
@@ -132,9 +139,9 @@
 foreach ($nodes as $node => $value) {
   $hpp .= "#define {$node} {$value}\n";
 }
-Filesystem::writeFile(
-  Filesystem::resolvePath('node_names.hpp', dirname(__FILE__)),
-  $hpp);
+
+
+Filesystem::writeFile($hpp_outpath, $hpp);
 echo pht('Wrote C++ definition.')."\n";
 
 $at = '@';
@@ -158,7 +165,7 @@
 }
 
 EOPHP;
-Filesystem::writeFile(
-  Filesystem::resolvePath('parser_nodes.php', dirname(__FILE__)),
-  $php);
+
+Filesystem::writeFile($php_outpath, $php);
+
 echo pht('Wrote PHP definition.')."\n";
diff --git a/support/xhpast/bin/xhpast-generate-version.php b/support/xhpast/bin/xhpast-generate-version.php
new file mode 100755
--- /dev/null
+++ b/support/xhpast/bin/xhpast-generate-version.php
@@ -0,0 +1,8 @@
+#!/usr/bin/env php
+<?php
+
+$arcanist_root = dirname(dirname(dirname(dirname(__FILE__))));
+require_once $arcanist_root.'/support/init/init-script.php';
+
+echo PhutilXHPASTBinary::EXPECTED_VERSION;
+echo "\n";
diff --git a/support/xhpast/xhpast.cpp b/support/xhpast/xhpast.cpp
--- a/support/xhpast/xhpast.cpp
+++ b/support/xhpast/xhpast.cpp
@@ -9,10 +9,13 @@
 int xhpast_process(std::string &in);
 void print_node(xhpast::Node *node);
 
+#ifndef XHPAST_VERSION
+#error Define XHPAST_VERSION when building XHPAST.
+#endif
+
 int main(int argc, char* argv[]) {
   if (argc != 1) {
-    // Coupling: modify also src/parser/xhpast/bin/PhutilXHPASTBinary.php
-    cout << "7.1.4\n";
+    cout << XHPAST_VERSION << "\n";
     return 0;
   }