diff --git a/c/fs_haiku.c b/c/fs_haiku.c
new file mode 100644
index 0000000..ea07c71
--- /dev/null
+++ b/c/fs_haiku.c
@@ -0,0 +1,10 @@
+#include <unistd.h>
+
+#include "fs.h"
+
+char *get_exename(char *buf, size_t size)
+{
+    (void)buf;
+    (void)size;
+    return NULL;
+}
diff --git a/c/fs_minix.c b/c/fs_minix.c
new file mode 100644
index 0000000..ea07c71
--- /dev/null
+++ b/c/fs_minix.c
@@ -0,0 +1,10 @@
+#include <unistd.h>
+
+#include "fs.h"
+
+char *get_exename(char *buf, size_t size)
+{
+    (void)buf;
+    (void)size;
+    return NULL;
+}
diff --git a/c/fs_sunos.c b/c/fs_sunos.c
new file mode 100644
index 0000000..ea07c71
--- /dev/null
+++ b/c/fs_sunos.c
@@ -0,0 +1,10 @@
+#include <unistd.h>
+
+#include "fs.h"
+
+char *get_exename(char *buf, size_t size)
+{
+    (void)buf;
+    (void)size;
+    return NULL;
+}