Some function definitions are missing without it,
for example sigaction.
Fixes ticket #5868
---
configure | 1 +
1 file changed, 1 insertion(+)
diff --git a/configure b/configure
index 899057d..0e2f459 100755
--- a/configure
+++ b/configure
@@ -4805,6 +4805,7 @@ case $target_os in
objformat="win32"
enable dos_paths
enabled shared && ! enabled small && check_cmd $windres --version &&
enable gnu_windres
+ add_cppflags -D_GNU_SOURCE
;;
*-dos|freedos|opendos)
network_extralibs="-lsocket"
--
2.8.3
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