Index: libcfa/src/concurrency/io.cfa
===================================================================
--- libcfa/src/concurrency/io.cfa	(revision 8108ba8a8f4d28b94bec400ffa195c7e3ecb16b5)
+++ libcfa/src/concurrency/io.cfa	(revision 108345a09ade0082054e226d8633c30da5ece5b6)
@@ -340,5 +340,5 @@
 	// for convenience, return both the index and the pointer to the sqe
 	// sqe == &sqes[idx]
-	struct $io_context * cfa_io_allocate(struct io_uring_sqe * sqes[], __u32 idxs[], __u32 want) {
+	struct $io_context * cfa_io_allocate(struct io_uring_sqe * sqes[], __u32 idxs[], __u32 want) libcfa_public {
 		// __cfadbg_print_safe(io, "Kernel I/O : attempting to allocate %u\n", want);
 
@@ -419,5 +419,5 @@
 	}
 
-	void cfa_io_submit( struct $io_context * inctx, __u32 idxs[], __u32 have, bool lazy ) __attribute__((nonnull (1))) {
+	void cfa_io_submit( struct $io_context * inctx, __u32 idxs[], __u32 have, bool lazy ) __attribute__((nonnull (1))) libcfa_public {
 		// __cfadbg_print_safe(io, "Kernel I/O : attempting to submit %u (%s)\n", have, lazy ? "lazy" : "eager");
 
Index: libcfa/src/concurrency/io/call.cfa.in
===================================================================
--- libcfa/src/concurrency/io/call.cfa.in	(revision 8108ba8a8f4d28b94bec400ffa195c7e3ecb16b5)
+++ libcfa/src/concurrency/io/call.cfa.in	(revision 108345a09ade0082054e226d8633c30da5ece5b6)
@@ -139,4 +139,5 @@
 // I/O Interface
 //=============================================================================================
+#pragma GCC visibility push(default)
 """
 
Index: libcfa/src/concurrency/io/setup.cfa
===================================================================
--- libcfa/src/concurrency/io/setup.cfa	(revision 8108ba8a8f4d28b94bec400ffa195c7e3ecb16b5)
+++ libcfa/src/concurrency/io/setup.cfa	(revision 108345a09ade0082054e226d8633c30da5ece5b6)
@@ -26,5 +26,5 @@
 
 #if !defined(CFA_HAVE_LINUX_IO_URING_H)
-	void ?{}(io_context_params & this) {}
+	void ?{}(io_context_params & this) libcfa_public {}
 
 	void  ?{}($io_context & this, struct cluster & cl) {}
@@ -66,5 +66,5 @@
 #pragma GCC diagnostic pop
 
-	void ?{}(io_context_params & this) {
+	void ?{}(io_context_params & this) libcfa_public {
 		this.num_entries = 256;
 	}