diff --git a/configure.in b/configure.in
index 51671c3..d81021d 100644
--- a/configure.in
+++ b/configure.in
@@ -1269,6 +1269,7 @@
 # Checks for C header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([       \
+        asm/unistd.h     \
         endian.h         \
         mqueue.h         \
         sys/endian.h     \