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--- ruby-2.0.0-p247.orig/io.c 2013-06-12 16:23:39.000000000 +0200
+++ ruby-2.0.0-p247/io.c 2013-10-26 23:02:53.000000000 +0200
@@ -8483,7 +8483,7 @@ do_ioctl(int fd, ioctl_req_t cmd, long n
#define DEFULT_IOCTL_NARG_LEN (256)
-#ifdef __linux__
+#if defined(__GLIBC__) && defined(__linux__)
static long
linux_iocparm_len(ioctl_req_t cmd)
{
@@ -8516,7 +8516,7 @@ ioctl_narg_len(ioctl_req_t cmd)
#endif
#ifdef IOCPARM_LEN
len = IOCPARM_LEN(cmd); /* on BSDish systems we're safe */
-#elif defined(__linux__)
+#elif defined(__GLIBC__) && defined(__linux__)
len = linux_iocparm_len(cmd);
#else
/* otherwise guess at what's safe */
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