$OpenBSD$
Unbreak build (must be improved before sending upstream).

Index: src/Makefile.am
--- src/Makefile.am.orig
+++ src/Makefile.am
@@ -40,11 +40,10 @@ driver_cflags = \
 driver_ldflags = \
 	-avoid-version		\
 	-no-undefined		\
-	-Wl,--no-undefined	\
 	$(NULL)
 
 driver_libs = \
-	-lpthread -lm -ldl	\
+	-lpthread -lm	\
 	$(DRM_LIBS) -ldrm_intel	\
 	$(NULL)
 
