diff --git a/src/lisp/plat/linux.c b/src/lisp/plat/linux.c
index 4a223a6..b71f342 100644
--- a/src/lisp/plat/linux.c
+++ b/src/lisp/plat/linux.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
+#include <unistd.h>
 
 void *malloc_aligned(size_t size)
 {
@@ -20,7 +21,7 @@
 	free(addr);
 }
 
-void *link(dasm_State **Dst)
+void *link_program(dasm_State **Dst)
 {
 	size_t size;
 	void *buf;
@@ -33,3 +34,8 @@
 	mprotect(buf, size, PROT_READ | PROT_EXEC);
 	return buf;
 }
+
+bool file_exists(const char *path)
+{
+	return access(path, F_OK) == 0;
+}
diff --git a/src/lisp/plat/plat.h b/src/lisp/plat/plat.h
index 3640005..1c4216a 100644
--- a/src/lisp/plat/plat.h
+++ b/src/lisp/plat/plat.h
@@ -3,6 +3,8 @@
 #include <dasm_proto.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stdbool.h>
+#include <sys/types.h>
 
 /* Platform specific definitions */
 
@@ -11,6 +13,9 @@
 void *realloc_aligned(void *addr, size_t size);
 void free_aligned(void *addr);
 
-void *link(dasm_State **Dst);
+void *link_program(dasm_State **Dst);
+
+extern ssize_t readlink(const char *pathname, char *buf, size_t buf_size);
+bool file_exists(const char *path);
 
 #define THREAD_LOCAL