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-rw-r--r--libiberty/configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/libiberty/configure.ac b/libiberty/configure.ac
index 922aa86..868be8e 100644
--- a/libiberty/configure.ac
+++ b/libiberty/configure.ac
@@ -155,6 +155,7 @@ AC_MSG_NOTICE([target_header_dir = $target_header_dir])
GCC_NO_EXECUTABLES
AC_PROG_CC
+AC_GNU_SOURCE
AC_SYS_LARGEFILE
AC_PROG_CPP_WERROR