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diff -uprN a/ipl/cfuncs/fpoll.c b/ipl/cfuncs/fpoll.c
--- a/ipl/cfuncs/fpoll.c 2020-05-10 21:46:39.730752626 -0600
+++ b/ipl/cfuncs/fpoll.c 2020-05-10 21:50:41.613577816 -0600
@@ -33,6 +33,10 @@
#include <sys/types.h>
#include <sys/time.h>
+#if defined(_MUSL)
+# include <stdio_ext.h>
+#endif
+
#include "icall.h"
int fpoll(int argc, descriptor *argv) /*: await data from file */
@@ -66,6 +70,9 @@ int fpoll(int argc, descriptor *argv) /*
#elif defined(_FSTDIO) /* new BSD library */
if (f->_r > 0)
RetArg(1);
+#elif defined(_MUSL) /* MUSL library */
+ if (__freadahead(f))
+ RetArg(1);
#else /* old AT&T library */
if (f->_cnt > 0)
RetArg(1);
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