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https://savannah.gnu.org/bugs/index.php?64036
https://bugs.gentoo.org/898786
Include <stdio.h> for the rename and perror functions. This avoids an
implicit function declaration and build failures with future compilers.
--- a/configure.ac
+++ b/configure.ac
@@ -384,6 +384,7 @@ m4_pushdef([GOOD],[test ! -f conftest-A && test -f conftest-B])dnl
m4_pushdef([HMMM],[./conftest$EXEEXT && GOOD])dnl
ZONK
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <stdio.h>
#include <unistd.h>
]],[
return 0 > rename ("conftest-A", "conftest-B");
@@ -480,6 +481,7 @@ AC_DEFINE_UNQUOTED([MMAP_SIGNAL],[${rcs_cv_mmap_signal-0}],
AC_CACHE_CHECK([if `wait' can handle ignored SIGCHLD],[rcs_cv_tolerant_wait],[
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <stdio.h>
#include <sys/types.h>
#include <errno.h>
#include <signal.h>
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