diff --git a/gnu/usr.bin/groff/xditview/Makefile b/gnu/usr.bin/groff/xditview/Makefile
index 3c6d2b60e9e..9aa11dcfeba 100644
--- a/gnu/usr.bin/groff/xditview/Makefile
+++ b/gnu/usr.bin/groff/xditview/Makefile
@@ -1,4 +1,4 @@
-.if exists(${X11BASE}/include)
+.if exists(${X11BASE}/include/X11/Xlib.h)
 .if exists(${X11BASE}/lib)
 .if exists(${DESTDIR}${X11BASE}/bin)
 .if exists(${DESTDIR}${X11BASE}/man/man1)