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-rw-r--r--butl/buildfile2
1 files changed, 1 insertions, 1 deletions
diff --git a/butl/buildfile b/butl/buildfile
index f016581..2e55d8e 100644
--- a/butl/buildfile
+++ b/butl/buildfile
@@ -18,7 +18,7 @@ lib{butl}: \
{hxx }{ utility } \
{hxx }{ version }
-cxx.poptions += -I$src_root
+cxx.poptions =+ -I$src_root
lib{butl}: cxx.export.poptions = -I$src_root
# Install into the butl/ subdirectory of, say, /usr/include/.