diff --git a/biology/stacks/Makefile b/biology/stacks/Makefile
index 5e1b270e1b98..e0264aa59d58 100644
--- a/biology/stacks/Makefile
+++ b/biology/stacks/Makefile
@@ -10,7 +10,12 @@ WWW=		https://catchenlab.life.illinois.edu/stacks/
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-USES=		compiler:c++11-lang gmake python shebangfix
+USES=		gmake python shebangfix
+.if !exists(/usr/include/omp.h)
+USES+=	compiler:gcc-c++11-lib
+.else
+USES+=	compiler:c++11-lang
+.endif
 
 SHEBANG_FILES=	scripts/*