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-rw-r--r--math/orpie/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/math/orpie/Makefile b/math/orpie/Makefile
index 8a90b27f8342..b12c91f22374 100644
--- a/math/orpie/Makefile
+++ b/math/orpie/Makefile
@@ -16,6 +16,7 @@ LIB_DEPENDS= libgsl.so:${PORTSDIR}/math/gsl
USES= gmake
USE_OCAML= yes
+USE_OCAML_CAMLP4=yes
GNU_CONFIGURE= yes
MAKE_JOBS_UNSAFE= yes