diff --git a/math/fann/Makefile b/math/fann/Makefile
index 85e71ff6a3f8..63d8bd6c79c3 100644
--- a/math/fann/Makefile
+++ b/math/fann/Makefile
@@ -1,19 +1,25 @@
 PORTNAME=	fann
 DISTVERSION=	2.2.0-20230126
 CATEGORIES=	math science
 
 MAINTAINER=	tzhuan@csie.org
 COMMENT=	Free open source neural network library
 WWW=		https://leenissen.dk/
 
 LICENSE=	LGPL21+
 LICENSE_FILE=	${WRKSRC}/LICENSE.md
 
 USES=		cmake pathfix
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	libfann
 GH_TAGNAME=	8409b42
 
+.if !exists(/usr/include/omp.h)
+PLIST_SUB=	OPENMP="@comment "
+.else
+PLIST_SUB=	OPENMP=""
+.endif
+
 .include <bsd.port.mk>
diff --git a/math/fann/pkg-plist b/math/fann/pkg-plist
index 0e982deeb0d5..b490ccd1056d 100644
--- a/math/fann/pkg-plist
+++ b/math/fann/pkg-plist
@@ -1,35 +1,35 @@
 include/doublefann.h
 include/fann.h
 include/fann_activation.h
 include/fann_cascade.h
 include/fann_cpp.h
 include/fann_data.h
 include/fann_data_cpp.h
 include/fann_error.h
 include/fann_internal.h
 include/fann_io.h
 include/fann_train.h
 include/fann_training_data_cpp.h
 include/fixedfann.h
 include/floatfann.h
-include/parallel_fann.h
-include/parallel_fann.hpp
+%%OPENMP%%include/parallel_fann.h
+%%OPENMP%%include/parallel_fann.hpp
 lib/cmake/fann/fann-config.cmake
 lib/cmake/fann/fann-use.cmake
 lib/libdoublefann.a
 lib/libdoublefann.so
 lib/libdoublefann.so.2
 lib/libdoublefann.so.2.2.0
 lib/libfann.a
 lib/libfann.so
 lib/libfann.so.2
 lib/libfann.so.2.2.0
 lib/libfixedfann.a
 lib/libfixedfann.so
 lib/libfixedfann.so.2
 lib/libfixedfann.so.2.2.0
 lib/libfloatfann.a
 lib/libfloatfann.so
 lib/libfloatfann.so.2
 lib/libfloatfann.so.2.2.0
 libdata/pkgconfig/fann.pc