OpenBSD does not have an rt library.

Index: lib/libv4lconvert/Makefile.in
--- lib/libv4lconvert/Makefile.in.orig
+++ lib/libv4lconvert/Makefile.in
@@ -551,7 +551,7 @@ libv4lconvert_la_SOURCES = libv4lconvert.c tinyjpeg.c 
 	libv4lconvert-priv.h libv4lsyscall-priv.h tinyjpeg.h \
 	tinyjpeg-internal.h $(am__append_1) $(am__append_2)
 libv4lconvert_la_CPPFLAGS = $(CFLAG_VISIBILITY) $(ENFORCE_LIBV4L_STATIC)
-libv4lconvert_la_LDFLAGS = $(LIBV4LCONVERT_VERSION) -lrt -lm $(JPEG_LIBS) $(ENFORCE_LIBV4L_STATIC)
+libv4lconvert_la_LDFLAGS = $(LIBV4LCONVERT_VERSION) -lm $(JPEG_LIBS) $(ENFORCE_LIBV4L_STATIC)
 ov511_decomp_SOURCES = ov511-decomp.c
 ov518_decomp_SOURCES = ov518-decomp.c
 EXTRA_DIST = Android.mk