1 files changed, 1 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 9c8d1173b..7b1be32e9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1781,6 +1781,7 @@ AC_MSG_CHECKING([for utf8 locale support])
 AC_RUN_IFELSE(
         [AC_LANG_PROGRAM([[
 #include <locale.h>
+#include <unistd.h>
         ]], [[
         char *loc = setlocale(LC_CTYPE, "en_US.UTF-8");
         if (loc != NULL)