Use autoconf HAVE_UNISTD_H instead of imake X_NOT_POSIX to find <unistd.h>

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/OS.c b/src/OS.c
index 8bc23dd..4c69005 100644
--- a/src/OS.c
+++ b/src/OS.c
@@ -7,7 +7,7 @@
 #include <X11/IntrinsicP.h>
 #include "Private.h"
 
-#ifndef X_NOT_POSIX
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>	/* for sysconf(), and getpagesize() */
 #endif