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-rw-r--r--build/file.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/build/file.cxx b/build/file.cxx
index 73ce7cb..b4b1b77 100644
--- a/build/file.cxx
+++ b/build/file.cxx
@@ -283,6 +283,7 @@ namespace build
if (t.type != token_type::name || t.value != var ||
((tt = lex.next ().type) != token_type::equal &&
+ tt != token_type::equal_plus &&
tt != token_type::plus_equal))
{
error << "variable '" << var << "' expected as first line in " << rbf;