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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 fd1da94..311899f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -307,6 +307,7 @@ dnl Checks for programs.
AC_PROG_CC
AC_PROG_INSTALL
AC_PROG_GCC_TRADITIONAL
+AC_GNU_SOURCE
if test "${WIN32}" = "yes"; then
AC_ARG_VAR([MAN2HTML], [man2html utility])