Avoid linking with libdl on BSD systems

FreeBSD does not have libdl, so, when linking with -ldl fails.
This patch simply check if you are running on BSD, and does not
invoke -ldl during compilation.

Signed-off-by: Breno Leitao <breno.leitao@gmail.com>

Makefile.am

@@ -64,7 +64,7 @@ pseries_platform_SOURCES = src/common/pseries_platform.c src/common/pseries_plat
 librtas_error_SOURCES = src/common/librtas_error.c src/common/librtas_error.h
 
 src_nvram_SOURCES = src/nvram.c src/nvram.h $(pseries_platform_SOURCES)
-src_nvram_LDADD = -ldl -lz
+src_nvram_LDADD = -lz @LIBDL@
 
 src_lsprop_SOURCES = src/lsprop.c $(pseries_platform_SOURCES)
 

configure.ac

@@ -58,6 +58,22 @@ AS_IF([test "x$with_librtas" != "xno"],
 
 AM_CONDITIONAL([WITH_LIBRTAS], [test "x$with_librtas" = "xyes"])
 
+# Check what OS you are running
+AC_CANONICAL_HOST
+case $host_os in
+	linux*)
+		LIBDL="-ldl"
+	;;
+	*freebsd*)
+		LIBDL=""
+	;;
+	*)
+	#Default Case
+		AC_MSG_ERROR([Your platform is not currently supported])
+	;;
+esac
+AC_SUBST(LIBDL)
+
 # check for systemd
 systemd_unit_dir=/usr/lib/systemd/system
 AC_ARG_WITH([systemd],