+OS_SRC = linux-os.c ppc-linux-os.c
+OS_LIBS = -ldl
+
+ifdef LISP_FEATURE_GENCGC
+ GC_SRC = gencgc.c
+else
+ GC_SRC = cheneygc.c
+endif
+
+ifdef LISP_FEATURE_SB_THREAD
+ OS_LIBS += -lpthread
+endif
+ifdef LISP_FEATURE_SB_CORE_COMPRESSION
+ OS_LIBS += -lz
+endif