backlight: Fix compiler error

/usr/include/xorg/os.h around line 579 reads:

extern _X_EXPORT char *
strndup(const char *str, size_t n);

However strndup is already defined by glibc, and this redefine causes a
compile error.

This gets triggered because backlight.c does:

Without first doing:

Causing HAVE_STRNDUP to not be defined.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/backlight.c b/src/backlight.c
index d5b10a07..f0c549e5 100644
--- a/src/backlight.c
+++ b/src/backlight.c
@@ -42,6 +42,8 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <dirent.h>
+
+#include <xorg-server.h>
 #include <xf86.h>
 #include <pciaccess.h>