Set ninja_required_version

We use features through ninja version 1.7 (implicit outputs).

Fixes #4.

1 files changed, 2 insertions, 0 deletions

diff --git a/gen.lua b/gen.lua
index 1a9ab56e..759143a5 100644
--- a/gen.lua
+++ b/gen.lua
@@ -1,3 +1,5 @@
+set('ninja_required_version', '1.7')
+
 set('builddir', config.builddir)
 set('outdir', '$builddir')