opt: fix libmusl compile.

[ccan] / ccan / opt / usage.c

diff --git a/ccan/opt/usage.c b/ccan/opt/usage.c
index 26150ea8cd409e6c84d5a33067fd15932bccb4dc..353d59bc48542d8423ddc3c437ed36146488ec37 100644 (file)
--- a/ccan/opt/usage.c
+++ b/ccan/opt/usage.c
@@ -4,7 +4,9 @@
 #include <sys/ioctl.h>
 #include <sys/termios.h> /* Required on Solaris for struct winsize */
 #endif
+#if HAVE_SYS_UNISTD_H
 #include <sys/unistd.h> /* Required on Solaris for ioctl */
+#endif
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>