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-rw-r--r--configure.ac3
1 files changed, 2 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index d47ef5a..3711d3b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,7 +12,8 @@ AC_CONFIG_SRCDIR([free.c])
AC_CONFIG_HEADERS([config.h])
# Checks for programs.
-AC_USE_SYSTEM_EXTENSIONS(_GNU_SOURCE)
+AC_USE_SYSTEM_EXTENSIONS
+AC_SYS_LARGEFILE
AC_PROG_AWK
AC_PROG_CC
AC_PROG_CC_STDC