"The getdtablesize functions has been deprecated by Posix and has been
removed from Android's LB64 ABI. Replace calls to it with the modern
equivalent sysconf(_SC_OPEN_MAX)."

- https://groups.google.com/a/chromium.org/forum/#!topic/chromium-reviews/AXhZapYuHi8

diff -u -r ../../racket-6.4/src/racket/src/port.c ./racket/src/src/port.c
--- ../../racket-6.4/src/racket/src/port.c	2016-01-14 12:11:20.000000000 -0500
+++ ./src/racket/src/port.c	2016-04-10 17:43:40.039414493 -0400
@@ -1090,7 +1090,7 @@
 # ifdef USE_ULIMIT
     dynamic_fd_size = ulimit(4, 0);
 # else
-    dynamic_fd_size = getdtablesize();
+    dynamic_fd_size = sysconf(_SC_OPEN_MAX);
 # endif
     /* divide by bits-per-byte: */
     dynamic_fd_size = (dynamic_fd_size + 7) >> 3;
@@ -1365,7 +1365,7 @@
 #    ifdef FIXED_FD_LIMIT
     limit = FIXED_FD_LIMIT;
 #    else
-    limit = getdtablesize();
+    limit = sysconf(_SC_OPEN_MAX);
 #    endif
 #   endif
 #  endif
@@ -10390,7 +10390,7 @@
 # ifdef USE_ULIMIT
   i = ulimit(4, 0);
 # else
-  i = getdtablesize();
+  i = sysconf(_SC_OPEN_MAX);
 # endif
   while (i--) {
     int cr;