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-rw-r--r--ext/coverage/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/coverage/extconf.rb b/ext/coverage/extconf.rb
index cf10ca8..769f85b 100644
--- a/ext/coverage/extconf.rb
+++ b/ext/coverage/extconf.rb
@@ -1,3 +1,4 @@
require 'mkmf'
+$VPATH << '$(topdir)' << '$(top_srcdir)'
$INCFLAGS << " -I$(topdir) -I$(top_srcdir)"
create_makefile('coverage')