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-rw-r--r--configure.ac1
1 files changed, 1 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 05b48c1..65c0b11 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,6 +35,7 @@ fi
# Checks for programs.
AC_PROG_CC
+AC_GNU_SOURCE
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S