1 files changed, 0 insertions, 1 deletions
diff --git a/libeio.m4 b/libeio.m4
index d2b8030..d9776f5 100644
--- a/libeio.m4
+++ b/libeio.m4
@@ -33,7 +33,6 @@ int main(void)
 }
 ],ac_cv_readahead=yes,ac_cv_readahead=no)])
 test $ac_cv_readahead = yes && AC_DEFINE(HAVE_READAHEAD, 1, readahead(2) is available (linux))
-test $ac_cv_readahead = yes && AC_DEFINE(_GNU_SOURCE, 1, _GNU_SOURCE required for readahead (linux))
 
 AC_CACHE_CHECK(for fdatasync, ac_cv_fdatasync, [AC_LINK_IFELSE([
 #include <unistd.h>