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-rw-r--r--ext/coverage/extconf.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/coverage/extconf.rb b/ext/coverage/extconf.rb
index 3ebced54a6..3a6f530a92 100644
--- a/ext/coverage/extconf.rb
+++ b/ext/coverage/extconf.rb
@@ -1,2 +1,5 @@
+# frozen_string_literal: false
require 'mkmf'
+$VPATH << '$(topdir)' << '$(top_srcdir)'
+$INCFLAGS << " -I$(topdir) -I$(top_srcdir)"
create_makefile('coverage')