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-rw-r--r--gprof/configure.in1
1 files changed, 1 insertions, 0 deletions
diff --git a/gprof/configure.in b/gprof/configure.in
index 8d98d80..e57cf3a 100644
--- a/gprof/configure.in
+++ b/gprof/configure.in
@@ -20,6 +20,7 @@ dnl config.h, to avoid any possible confusion with the bfd config.h.
AC_CONFIG_HEADERS([gconfig.h:gconfig.in])
AC_PROG_CC
+AC_GNU_SOURCE
AC_PROG_INSTALL
AC_CHECK_FUNCS(setmode)