Ideally we should like with -ldl for dlopen() dlclose().

Makefile.am

@@ -27,7 +27,7 @@ cgminer_SOURCES	= elist.h miner.h compat.h bench_block.h	\
 		  adl.c	adl.h adl_functions.h			\
 		  phatk110817.cl poclbm110817.cl
 
-cgminer_LDFLAGS	= $(PTHREAD_FLAGS)
+cgminer_LDFLAGS	= $(PTHREAD_FLAGS) -ldl
 cgminer_LDADD	= @LIBCURL_LIBS@ @JANSSON_LIBS@ @PTHREAD_LIBS@ @OPENCL_LIBS@ @NCURSES_LIBS@ @PDCURSES_LIBS@ @WS2_LIBS@ lib/libgnu.a ccan/libccan.a
 cgminer_CPPFLAGS = -I$(top_builddir)/lib -I$(top_srcdir)/lib