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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);