Index: devel/libpru/Makefile
===================================================================
--- devel/libpru/Makefile
+++ devel/libpru/Makefile
@@ -10,17 +10,10 @@
 
 LICENSE=	BSD2CLAUSE
 
+ONLY_FOR_ARCHS= armv7
 IGNORE_DragonFly=	only supported on FreeBSD
-USES=		cmake compiler
+USES=		compiler
 
 WRKSRC=		${WRKDIR}/rpaulo-libpru-5a74157b82b8
 
-.include <bsd.port.pre.mk>
-
-post-patch:
-	${REINPLACE_CMD} -e 's/ -Weverything//'  ${WRKSRC}/CMakeLists.txt
-.if ${CHOSEN_COMPILER_TYPE} == gcc
-	${REINPLACE_CMD} -e 's/ -Werror//'  ${WRKSRC}/CMakeLists.txt
-.endif
-
-.include <bsd.port.post.mk>
+.include <bsd.port.mk>
Index: devel/libpru/files/patch-Makefile
===================================================================
--- devel/libpru/files/patch-Makefile
+++ devel/libpru/files/patch-Makefile
@@ -0,0 +1,33 @@
+--- /dev/null	2020-06-20 16:26:14.515198000 +0200
++++ Makefile	2020-06-20 16:26:11.362577000 +0200
+@@ -0,0 +1,30 @@
++CC?= cc
++CFLAGS+= -c -fPIC -pedantic -Wall -Wextra -I ./
++LDFLAGS+= -shared
++TARGET= libpru.so
++OBJECTS= pru.o ti-pru.o
++
++all: $(TARGET)
++
++$(TARGET): $(OBJECTS)
++	$(CC) $(LDFLAGS) -o $(TARGET) $(OBJECTS)
++
++pru.o: pru.c
++	$(CC) $(CFLAGS) pru.c
++	
++ti-pru.o: ti-pru.c
++	$(CC) $(CFLAGS) ti-pru.c
++
++install:
++	install -m 0755 libpru.so ${DESTDIR}/usr/local/lib
++	install -l s -m 0755 /usr/local/lib/libpru.so ${DESTDIR}/usr/local/lib/libpru.so.2
++	install -m 0644 libpru.h ${DESTDIR}/usr/local/include/
++
++deinstall:
++	rm ${DESTDIR}/usr/local/lib/libpru.so
++	rm ${DESTDIR}/usr/local/include/libpru.h
++
++clean:
++	rm -f $(OBJECTS)
++	rm -f $(TARGET)
++