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-rw-r--r--configure.in1
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.in b/configure.in
index 3f636c12..6b2fff48 100644
--- a/configure.in
+++ b/configure.in
@@ -43,6 +43,7 @@ fi
dnl Checks for programs.
+AC_GNU_SOURCE
AC_PROG_CC
AC_PROG_YACC
AM_PROG_LEX